Reference:1811: Difference between revisions

|title=Rolex 1811 Day-Date : Morellis (Moiré) Finish President | Rolexopedia

|description=The 1811 is the Morellis (moiré) finish 4-digit Day-Date: a fine watered texture on the bezel and President bracelet center links, the rarest of the decorated trio with the Florentine 1806 and bark 1807. 36mm 18k gold, caliber 1555/1556.

| late 1960s into the 1970s (4-digit era)

| caliber 1555 (to c. 1965), then caliber 1556; hacking from 1972; no quickset

The 1811 uses the four-digit Day-Date movement family. Reference material places caliber 1555 before caliber 1556, with 19,800 vph on the later movement; hacking was added during 1556 production. Four-digit Day-Date references do not have a quick-set day/date mechanism. Exact fitment should be checked from the movement and case evidence. The [[Reference:Movements]] page holds the caliber lineage, and the [[Reference:1803|1803]] entry covers the 1555-to-1556 transition in detail.

The case is the 36mm three-piece gold Oyster shared across the 4-digit Day-Date, with a Twinlock screw-down crown, screw-down caseback and acrylic crystal. The defining feature is the Morellis finish on the bezel, a fine watered moiré, finer than both the Florentine cross-hatch of the 1806 and the coarse bark of the 1807. It came in yellow, white and pink gold to match the case.

The Morellis 1811 appears in the cited auction records as an occasional lot. Those records do not establish a complete production total. Antiquorum sold a yellow-gold example in New York on 8 December 2016 (Lot 211): a 1967 piece, cal. 1556, satiné silver dial, 36mm case on a President bracelet with textured center links, complete with its original Chronometer Certificate and booklet. The catalogue text calls the bezel finish "moiré crosshatch," which is the primary-source confirmation behind the collector "Morellis" name. Estimated at USD 8,000-12,000, it sold for USD 17,500.

A second Antiquorum lot, Hong Kong, 28 May 2022 (Lot 211), catalogues a yellow-gold example from around the same period: case no. 1,672,343 by Genex of Geneva, cal. 1555, on a President bracelet the lot text describes as "hammered" rather than moiré. Both lots record a second number stamped alongside 1811 on the caseback (1803 in the 2016 lot, 1601 in the 2022 lot), without further explanation in the catalogue text. Whether "hammered" and "moiré crosshatch" are two words for the same texture or mark a genuine sub-variant is not settled by these two lots alone. Estimated at HKD 95,000-144,000, the piece sold for HKD 115,000.