Rolex
Rolex Day-Date 40 228348RBR
The Rolex Day-Date 40 (reference 228348RBR) is a 40 mm 18k yellow 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
- 228348RBR
- Collection
- Day-Date
- Case size
- 40 mm
- Case material
- 18k yellow gold
- Crystal
- Sapphire
- Water resistance
- 100 m
- Bracelet / strap
- 18k yellow gold
Dial and bezel
- Bezel
- Diamond-set (18k yellow 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.
228348RBR Black
228348RBR-0004
Black · Diamond; Bezel; count/carats not published in source
228348RBR Black Baguette-cut diamond indexes
228348RBR-0001
Baguette-cut diamond indexes · Diamond; Bezel; count/carats not published in source; Diamond; Baguette; Dial indexes; count/carats not published in source
228348RBR Black Onyx
228348RBR-0039
Onyx · Diamond; Bezel; count/carats not published in source
228348RBR Champagne Baguette-cut diamond indexes
228348RBR-0002
Baguette-cut diamond indexes · Diamond; Bezel; count/carats not published in source; Diamond; Baguette; Dial indexes; count/carats not published in source
228348RBR Champagne
228348RBR-0008
Champagne · Diamond; Bezel; count/carats not published in source
228348RBR Champagne Roman numerals
228348RBR-0003
Roman numerals · Diamond; Bezel; count/carats not published in source
228348RBR Diamond-paved
228348RBR-0037
Paved diamond dial · Diamond; Bezel; count/carats not published in source; Diamond; Dial (paved); count/carats not published in source
228348RBR Green Roman numerals
228348RBR-0040
Roman numerals · Diamond; Bezel; count/carats not published in source
228348RBR Green Ombre
228348RBR-0045
Ombre · Diamond; Bezel; count/carats not published in source
228348RBR Mother-of-Pearl
228348RBR-0046
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
228348RBR Silver
228348RBR-0042
Silver · Diamond; Bezel; count/carats not published in source
228348RBR Silver Roman numerals
228348RBR-0007
Roman numerals · Diamond; Bezel; count/carats not published in source
228348RBR White
228348RBR-0034
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 |
|---|---|---|---|---|---|
| 228348RBR (This watch) | 40 mm | 18k yellow 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 228348RBR?
- The Rolex Day-Date 40 228348RBR has a 40 mm case.
- What movement does the Rolex Day-Date 40 228348RBR use?
- It uses the automatic caliber 3255, with a 70-hour power reserve.
- How water resistant is the Rolex Day-Date 40 228348RBR?
- It is water resistant to 100 metres.
- What is the Rolex Day-Date 40 228348RBR made of?
- The case is 18k yellow gold. Bracelet or strap: 18k yellow gold.
- Which dials was the Rolex Day-Date 40 228348RBR made with?
- The catalog lists 7 dials: Black, Champagne, Diamond-paved, Green, Mother-of-Pearl, Silver, White.
Catalog facts checked October 2026.