économies ROLEX VALJOUX 69 13" 23 Chronographe Brevet 6,4mm Couronne Dôme Bas

Up for sale is a vintage 1940s ROLEX BREVET stainless steel low dome crown, in mint condition.
I have attached an excerpt of the Brevet, of Hans Wilsdorf / Rolex, granted on 1st June, 1927.

Diameter is ~6.4 mm. Thickness is ~ 2mm. Will fit a TAP 9 (0.9mm) stem, such as in Valjoux 23, Valjoux 69, Venus 140, etc.
Could fit one of the following references: 2737, 2811, 2917, 2918, 2920, 3233, 3529, 4099, etc.

The sale is only for 1 (one) piece. Only have 3 crowns of these left. Original Rolex dead stock material, see the crimp marks on the underside.

You will receive exactly what you see in photos.

Any other defects not mentioned in description but visible in the pictures will be considered as described.

The item is Guaranteed 100% Authentic and as Described.