Citizen Corso Diamond BM7644-51E
Ref. BM7644-51E · Black dial · In production
- Case40 mm
- Water res.100 m
- MovementSolar
- CrystalMineral
Citizen Corso Diamond BM7644-51E size, specs and price at a glance
The Citizen Corso Diamond BM7644-51E is 40 mm wide. Citizen does not publish its lug-to-lug length. and ships on a bracelet. Inside is the E111 solar calibre, water resistant to 100 m. US list price: $725 when we last checked citizenwatch.com (3 Nov 2026).
Strap shopping? See our Citizen lug width chart.
Overview
The Citizen BM7644-51E is a dress watch from the Corso collection, part of the Corso Diamond family. It has a 40 mm stainless steel case. Citizen lists the dial as black. Inside is a solar movement (calibre E111). You also get 100 m water resistance, a mineral crystal and a bracelet.
Who it suits
- Wrists of roughly 16.0–17.9 cm (6.3–7.0 in), by our Watch Finder sizing guide
- Everyday wear including swimming
- Shirt cuffs and smarter dress codes
- Grab-and-go wear without winding or setting
Trade-offs
- Mineral crystal scratches more easily than sapphire
Written by Watch.co from the published specs below. These are not owner reviews.
Full specifications
Case
| Case diameter | 40 mm | citizenwatch.com · 3 Nov 2026 |
|---|---|---|
| Lug-to-lug | Not published by Citizen | |
| Case material | Stainless steel | citizenwatch.com · 3 Nov 2026 |
| Crystal | Mineral | citizenwatch.com · 3 Nov 2026 |
| Water resistance | 100 m | citizenwatch.com · 3 Nov 2026 |
Dial
| Dial colour | Black | citizenwatch.com · 3 Nov 2026 |
|---|---|---|
| Date | Date | citizenwatch.com · 3 Nov 2026 |
Movement
| Movement type | Solar | citizenwatch.com · 3 Nov 2026 |
|---|---|---|
| Calibre | E111 | citizenwatch.com · 3 Nov 2026 |
Strap / Bracelet
| Bracelet / strap | Bracelet | citizenwatch.com · 3 Nov 2026 |
|---|
Other
| US list price (MSRP) | $725 | citizenwatch.com · 3 Nov 2026 |
|---|---|---|
| Production status | In production | citizenwatch.com · 3 Nov 2026 |
| Style (our classification) | Dress | our classification |
Specs are summarised in our own words from the brand's product page. Each row links its source and the date we checked it. Fields we haven't verified are left out rather than guessed.
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Questions about the Citizen Corso Diamond BM7644-51E
How big is the Citizen Corso Diamond BM7644-51E?
The case is 40 mm wide.
What movement does the Citizen Corso Diamond BM7644-51E use?
It uses the E111 calibre, a solar movement.
Can I swim with the Citizen Corso Diamond BM7644-51E?
Yes. It is rated to 100 m.
Does the Citizen Corso Diamond BM7644-51E have a date?
Yes, it shows the date.
How much is the Citizen Corso Diamond BM7644-51E?
The US list price was $725 on citizenwatch.com when we checked on 3 Nov 2026. Prices change, so check before you buy.
Will the Citizen Corso Diamond BM7644-51E fit my wrist?
By our sizing guide it sits best on wrists of about 16.0–17.9 cm (6.3–7.0 in). Use the fit checker on this page to test your own wrist.
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