--- title: "Shachihata Connecting Calendar Stamp: Any Month, Any Year" canonical: "https://stationerytimes.com/guides/shachihata-connecting-calendar-stamp/" description: "Shachihata connecting calendar stamp (GRJ-5ACE) explained: 38 interlocking rubber pieces that build any month in English, a 47 × 24 mm print, ink pads, price." category: "Stamps" type: "Rubber stamp set" published: 2026-10-22 updated: 2026-10-22 author: "Ellis Penhale" publisher: "Stationery Times" sources: 5 products: - name: "Shachihata connecting number stamp, perpetual calendar, English (GRJ-5ACE)" brand: "Shachihata" brand_origin: "Japan" made_in: "Not stated" material: "Rubber stamp faces on interlocking holders (Amazon US); no built-in ink" released: "2023" price_band: "$$$ ($20–75 per stamp or ink pad, typical US retail, October 2026)" manufacturer: "Shachihata Inc. (Nagoya)" model: "Connecting number stamp, perpetual calendar" mpn: "GRJ-5ACE" gtin: "4974052592133" url: "https://item.shachihata.co.jp/catalog/w020007/00059213/" --- # Shachihata Connecting Calendar Stamp: Any Month, Any Year > The Shachihata connecting number stamp, perpetual calendar in English (GRJ-5ACE), is a set of rubber stamp pieces that snap together up and down or side to side to build any month. Its Amazon listing gives 38 pieces plus 2 blanks, printing a five-week month about 47 × 24 mm. It needs a separate ink pad. - URL: https://stationerytimes.com/guides/shachihata-connecting-calendar-stamp/ - Category: Stamps - Author: Ellis Penhale - Published: 2026-10-22 - Updated: 2026-10-22 ![Shachihata connecting calendar stamp assembled from seven columns of pieces, beside a printed month](https://stationerytimes.com/images/raster/shachihata-connecting-calendar-stamp-16x9.png) *The assembled calendar at Shachihata's 52.6 × 60.3 mm, drawn to scale.* Original drawing (SVG): . Drawings © 2026 Stationery Times, reusable with credit under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). ## Product facts | Product | Brand | Brand origin | Made in | Material | Released | Price range (typical US retail, October 2026) | |---|---|---|---|---|---|---| | Shachihata connecting number stamp, perpetual calendar, English (GRJ-5ACE) | Shachihata (by Shachihata Inc. (Nagoya)) | Japan | Not stated | Rubber stamp faces on interlocking holders (Amazon US); no built-in ink | 2023 | $$$: $20–75 per stamp or ink pad | - Made in (Shachihata connecting number stamp, perpetual calendar, English (GRJ-5ACE)): Not stated. Shachihata's catalog page lists sizes, weights, JAN and price but not the country of manufacture, and the Amazon US listing doesn't state it either. ## Key takeaways - The set has 38 rubber pieces, 7 days and 31 dates, plus 2 blanks, per its Amazon US listing. - Assembled as a calendar it measures 52.6 × 26.2 × 60.3 mm and weighs 65.5 g, per Shachihata's catalog. - A full five-week month prints about 47 × 24 mm (1.9 × 0.9 in), the size of a small planner box. - Shachihata lists it at ¥3,410 (about US$22) including tax, under its Shachi・iro brand; JAN 4974052592133. - Its Amazon US listing had 423 ratings averaging 4.8 stars on October 22, 2026. ## What is the Shachihata connecting calendar stamp? **It's a rubber stamp you build yourself: small pieces for each weekday and date that lock together into any month, then come apart for the next.** Shachihata calls it a "connecting number stamp, perpetual calendar". Because you rebuild it each month, one set covers every month of every year. It's popular with planner and bullet-journal users who draw their own monthly pages. ## How do the pieces connect? **Bumps and recesses on each holder fit into its neighbours, so pieces join both up and down and side to side.** Shachihata says that turning a piece upside down before connecting it leaves a blank space. ![A month printed by the GRJ-5ACE drawn to scale, 47 × 24 mm, with day letters S M T W T F S and dates 1 to 31](https://stationerytimes.com/images/shachihata-connecting-calendar-stamp-print.svg) *A five-week month at 1 mm = 8 px; this example starts on a Wednesday.* That's how you shift the 1 to the right weekday: fill the days before it with upside-down pieces or the 2 blanks. ## How do you build a month? **Lay out the day letters, then add the dates in order, filling the days before the 1st with blanks.** 1. Snap S, M, T, W, T, F and S into a row; this row stays the same every month. 2. Under the row, line the 1 up with its weekday, using the 2 blanks or a piece turned upside down as spacers. 3. Add 1 to 31 in order, starting a new row every seven pieces; stop at 28, 29 or 30 for shorter months. 4. Ink lightly, stamp straight down, and lift. A month that starts on a Saturday and has 31 days needs a sixth row, so plan the stamp area before you start. ## Shachihata GRJ-5ACE specs | Spec | Value | |---|---| | Maker | Shachihata Inc. (Nagoya), Shachi・iro brand | | Model | GRJ-5ACE (English); GRJ-5ACJ is Japanese | | Pieces | 38 (7 days, 31 dates) plus 2 blanks (Amazon US) | | Assembled size | 52.6 × 26.2 × 60.3 mm (2.1 × 1.0 × 2.4 in) | | Weight | 65.5 g (2.3 oz) assembled | | Print | About 47 × 24 mm (1.9 × 0.9 in), five weeks | | Ink | None built in; use a stamp pad | | Japan list price | ¥3,410 (about US$22), tax included | | JAN | 4974052592133 | | Launched | 2023 | | Price band | $$$ ($20–75) | ## Which ink pad should you use? **Any pad made for rubber stamps works; the Amazon listing recommends Shachihata's own Iromoyo pads.** Choose the ink for your paper. | Paper | Ink type | Example | |---|---|---| | Most planner paper, crisp small text | Oil-based pigment | [VersaFine Onyx Black](https://stationerytimes.com/guides/versafine-onyx-black-ink-pad/) | | Pages you'll color over with markers | Water-based dye | [Memento Tuxedo Black](https://stationerytimes.com/guides/memento-tuxedo-black-ink-pad/) | | Plastic, glossy or coated pages | Solvent | [StazOn](https://stationerytimes.com/guides/stazon-ink-pad/) | Small digits blur if the pad is over-inked, so tap the stamp lightly and press straight down. ## How does it compare with other planner stamps? **It's the only one here that prints a whole month; the others add dates or small icons.** | Stamp | What it prints | Ink | Price band | |---|---|---|---| | Shachihata GRJ-5ACE | Any month, built from pieces | Separate pad | $$$ | | [Midori Paintable Rotating Date Stamp](https://stationerytimes.com/guides/midori-paintable-rotating-date-stamp/) | A date | Separate pad | $$$ | | [Kodomo no Kao Pochitto6](https://stationerytimes.com/guides/kodomo-no-kao-pochitto6-push-button-stamp/) | Six small icons | Self-inking | $$ | ## Who is it for? **It suits planner users who set up their own monthly pages, such as bullet journalers and anyone using a dot-grid notebook as a planner.** It saves drawing a calendar grid by hand every month. It's less useful if your planner already prints its calendars, or if you want decoration rather than dates; for that, icon stamps are a better fit. ## What else is in the connecting stamp range? **Shachihata also sells a numbering set and, from March 9, 2026, large month-and-day numbers and decorative frame pieces.** The numbering set (GRJ-5AN) has its own symbol pieces, such as a hyphen, a star and a page mark, but Shachihata says those symbols don't fit the calendar set. The Japanese-weekday calendar is GRJ-5ACJ. ## Where is the Shachihata calendar stamp made? **Shachihata doesn't say.** Its catalog page and the Amazon US listing give no country of manufacture. Shachihata is a Japanese stamp maker based in Nagoya, best known in Japan for its self-inking name seals. ## Frequently asked questions ### How do you set a month on the Shachihata calendar stamp? Snap the seven day letters into a row, then add the dates under the right weekday, starting the 1 under the first day of the month. Turn a piece upside down where you need a blank, per Shachihata. ### Does the Shachihata perpetual calendar stamp have ink? No. Shachihata says it has no built-in ink and the pad is sold separately; its listing recommends Shachihata's Iromoyo pads, and any pad for rubber stamps works. ### Can you use the number pieces for other things? Yes. The pieces join freely, so you can stamp a page number, a date or a count. Shachihata also sells a separate numbering set (GRJ-5AN) and symbol pieces, though it says the symbols don't fit the calendar set. ### Is there a Japanese version of the calendar stamp? Yes, GRJ-5ACJ, which prints the weekdays in Japanese. GRJ-5ACE is the English version. ### How big is a month printed with GRJ-5ACE? About 47 mm wide and 24 mm tall for five weeks, according to its Amazon listing. That fits a monthly box in most A5 and A6 planners. ### Is the Shachihata calendar stamp made in Japan? Shachihata doesn't say. Shachihata is a Nagoya company, but its catalog page and the Amazon US listing give no country of manufacture. ## Sources - [連結数字スタンプ 万年カレンダー 英語 GRJ-5ACE (Shachihata catalog: code 00059213, JAN 4974052592133, ¥3,100 plus tax, Shachi・iro, sizes and weights, joins up and down or across, upside-down for a blank, no built-in ink; read October 22, 2026)](https://item.shachihata.co.jp/catalog/w020007/00059213/) - [連結数字スタンプ 万年カレンダー 日本語 GRJ-5ACJ (Shachihata catalog: Japanese version; seen in search results)](https://item.shachihata.co.jp/catalog/w020007/00059212/) - [シヤチハタ: 「連結数字スタンプ」に「月日」「フレーム」が新登場 (press release February 18, 2026 via Koubo: series launched 2023 with numbering and perpetual calendar; new types from March 9, 2026; read in full)](https://koubo.jp/press-release/prtimes/c5556_r404) - [Amazon US: Shachihata GRJ-5ACE Perpetual Calendar Stamp, English (38 pieces plus 2 blanks, 24 × 47 mm print, Iromoyo pads; ratings and rank read October 22, 2026)](https://www.amazon.com/dp/B0C38LFV1P) - [JetPens: Shachihata Connecting Stamp, English Calendar Set (seen in search results)](https://www.jetpens.com/Shachihata-Connecting-Stamp-English-Calendar-Set/pd/38637)