The two-tone diamond Lady-Datejust, Very Good, with the box.

The Lady-Datejust is the Datejust at 26mm, the size Rolex made for women from the 1950s until it moved the line to 28mm in 2015. It is the same watch in miniature: an Oyster case with a screw-down crown, an automatic chronometer movement, the date under its Cyclops lens at three, a fluted or engine-turned bezel, and a Jubilee or Oyster bracelet. Because Rolex made them for six decades in every dial and metal, the pre-owned market is deep and this is where the money goes when people search for a women’s Rolex.

The box is the difference between this unit and the Good one below it, along with a cleaner case; the dated warranty card is the difference between this one and the unit above it. An N-series serial puts the watch around 1991, early in the 69173 run, when the two-tone Lady-Datejust with a diamond dial was the standard-issue gift watch. The diamond markers on champagne are a Rolex factory dial layout; ask Rebag to confirm the dial is original.

Rebag gives the case at 26mm and 11mm high, the band at 13mm, a wrist size of about 6.25 inches, the band as stainless steel with 18k yellow gold, the case as stainless steel, the dial colour as gold, an automatic movement with date and a screw-down crown, the box as included, and the condition as Very Good with scratches and minor wear. It gives no reference; the N-series reading of the part number is an inference. The fluted bezel, diamond markers and Jubilee bracelet are from the photograph; the calibre, chronometer rating, reserve and 100 metres are Rolex’s published figures for the 69173.

Rebag authenticates in-house and is not a Rolex authorised dealer, and Amazon adds its 30-day return window. Ask for the reference, whether the diamond dial is factory, and when it was last serviced. Nothing here was measured on the watch.

This unit is sold by Rebag through Amazon Luxury Stores, authenticated by the seller with Amazon’s 30-day return window on top; it is one piece, and when it sells the listing goes away, so the second button opens the live search for 26mm Lady-Datejusts.

Steel and two-tone Lady-Datejusts have resold close to what pre-owned buyers paid, sometimes more, sometimes less; that is a pattern, not a promise, and nothing here is investment advice.