Rolex
Rolex Day-Date 40 228345RBR
The Rolex Day-Date 40 (reference 228345RBR) is a 40 mm 18k Everose gold watch. It runs on the automatic caliber 3255 with a 70-hour power reserve and is water resistant to 100 m.
Specifications
Case
- Reference
- 228345RBR
- Collection
- Day-Date
- Case size
- 40 mm
- Case material
- 18k Everose gold
- Crystal
- Sapphire
- Water resistance
- 100 m
- Bracelet / strap
- 18k Everose gold
Dial and bezel
- Bezel
- Diamond-set (18k everose gold)
Movement
- Movement
- Automatic
- Caliber
- 3255
- Power reserve
- 70 hours
- Frequency
- 28,800 vph
- Jewels
- 31
- Functions
- Date, Day
Dial versions
This reference was made with these dials and finishes.
228345RBR Chocolate Diagonal motif
228345RBR-0005
Diagonal motif · Diamond; Bezel; count/carats not published in source
228345RBR Chocolate Baguette-cut diamond indexes
228345RBR-0006
Baguette-cut diamond indexes · Diamond; Bezel; count/carats not published in source; Diamond; Baguette; Dial indexes; count/carats not published in source
228345RBR Chocolate
228345RBR-0024
Chocolate · Diamond; Bezel; count/carats not published in source
228345RBR Chocolate Roman numerals
228345RBR-0009
Roman numerals · Diamond; Bezel; count/carats not published in source
228345RBR Diamond-paved
228345RBR-0002
Paved diamond dial · Diamond; Bezel; count/carats not published in source; Diamond; Dial (paved); count/carats not published in source
228345RBR Eisenkiesel
228345RBR-0016
Eisenkiesel (stone dial) · Diamond; Bezel; count/carats not published in source
228345RBR Green
228345RBR-0011
Roman numerals · Diamond; Bezel; count/carats not published in source
228345RBR Mother-of-Pearl
228345RBR-0026
Mother-of-pearl; Baguette-cut diamond indexes · Diamond; Bezel; count/carats not published in source; Diamond; Baguette; Dial indexes; count/carats not published in source
228345RBR Slate
228345RBR-0025
Ombre · Diamond; Bezel; count/carats not published in source
228345RBR Sundust Stripe motif
228345RBR-0010
Stripe motif · Diamond; Bezel; count/carats not published in source · “Sundust”
228345RBR Sundust Baguette-cut diamond indexes
228345RBR-0007
Baguette-cut diamond indexes · Diamond; Bezel; count/carats not published in source; Diamond; Baguette; Dial indexes; count/carats not published in source · “Sundust”
228345RBR Sundust Roman numerals
228345RBR-0008
Roman numerals · Diamond; Bezel; count/carats not published in source · “Sundust”
228345RBR White
228345RBR-0012
Roman numerals · Diamond; Bezel; count/carats not published in source
How it compares within the Day-Date family
Side by side with other references in the same collection, from the catalog.
| Reference | Size | Material | Dial | Caliber | Years |
|---|---|---|---|---|---|
| 228345RBR (This watch) | 40 mm | 18k Everose gold | — | 3255 | — |
| 128235 | 36 mm | 18k Everose gold | Chocolate / Sundust / various | 3255 | 2019– |
| 128238 | 36 mm | 18k yellow gold | Champagne / Green / Silver / various | 3255 | 2019– |
| 128239 | 36 mm | 18k white gold | — | 3255 | 2019– |
| 128396TBR | 36 mm | Platinum | — | 3255 | — |
| 228206 | 40 mm | 950 platinum | Ice blue | 3255 | 2015– |
| 228235 | 40 mm | 18k Everose gold | — | 3255 | 2015– |
| 228238 | 40 mm | 18k yellow gold | — | 3255 | 2015– |
| 228239 | 40 mm | 18k white gold | — | 3255 | 2015– |
About the Day-Date family
The Day-Date was introduced in 1956 as the first wristwatch to show the day of the week spelled out in full, in a window at 12 o'clock, alongside the date. It has only ever been made in precious metal, 18k gold or platinum, and is usually worn on the President bracelet created for it.
Generations are told apart by reference and movement: the quickset references of the late 1970s and 1980s, the 18238 and 118238 with caliber 3155, then the Day-Date 40 (for example ref. 228238) from 2015 and the Day-Date 36 (for example ref. 128238) from 2019, both with caliber 3255. Dials range from plain colours to stone, meteorite and diamond-set versions, and the day disc can be in many languages. Dealers check that dial, bezel and bracelet are original to the watch.
Quick answers
- What size is the Rolex Day-Date 40 228345RBR?
- The Rolex Day-Date 40 228345RBR has a 40 mm case.
- What movement does the Rolex Day-Date 40 228345RBR use?
- It uses the automatic caliber 3255, with a 70-hour power reserve.
- How water resistant is the Rolex Day-Date 40 228345RBR?
- It is water resistant to 100 metres.
- What is the Rolex Day-Date 40 228345RBR made of?
- The case is 18k Everose gold. Bracelet or strap: 18k Everose gold.
- Which dials was the Rolex Day-Date 40 228345RBR made with?
- The catalog lists 8 dials: Chocolate, Diamond-paved, Eisenkiesel, Green, Mother-of-Pearl, Slate, Sundust, White.
Catalog facts checked October 2026.