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.
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Product facts
- Product
- 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 range
- $$$$20–75 per stamp or ink pad
- Rate it
Notes on these facts
- Made by Shachihata Inc. (Nagoya). Country of manufacture 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. Price: example listing. Released: Shachihata's February 18, 2026 release says the connecting number stamp launched in 2023 in two types, numbering and perpetual calendar; we didn't find the exact date for the English calendar.
- Price bands are typical US retail, checked October 2026. Conversions to US dollars are approximate, at October 2026 rates (US$1 = ¥158 = ₩1,330 = NT$32.5 = CN¥6.7 = SEK 9.9 = DKK 6.7 = ₺49.6 = C$1.41 = A$1.43 = CZK 21.7; €1 = US$1.12; £1 = US$1.32; CHF 1 = US$1.21).
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.
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.
- Snap S, M, T, W, T, F and S into a row; this row stays the same every month.
- Under the row, line the 1 up with its weekday, using the 2 blanks or a piece turned upside down as spacers.
- Add 1 to 31 in order, starting a new row every seven pieces; stop at 28, 29 or 30 for shorter months.
- 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 |
| 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 |
| Pages you’ll color over with markers | Water-based dye | Memento Tuxedo Black |
| Plastic, glossy or coated pages | Solvent | StazOn |
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 | $$$ |
| Midori Paintable Rotating Date Stamp | A date | Separate pad | $$$ |
| Kodomo no Kao Pochitto6 | 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)
- 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)
- 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)
- 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)
- JetPens: Shachihata Connecting Stamp, English Calendar Set (seen in search results)