1979 Cartier Vintage Ladies Tank Watch with Deployment Buckle - Solid 18K Gold Moonphase but it is more likely

but it is more likely a very high quality aftermarket addition

winding crown and even the signed crystal

A notable exception to this trend were Omega's full size watches with 30mm movements

OR ET ACIER

1979 Cartier Vintage Ladies Tank Watch with Deployment Buckle - Solid 18K Gold Moonphase but it is more likelyDesigned personally by Louis Cartier in 1917 and patterned after an army tank, Cartier's Tank watches symbolized speed and achievement and have become one of the company's iconic models. Before cost cutting measures brought about the widespread use of quartz movements for certain wristwatches, Cartier utilized Swiss crafted mechanical movements. Using centuries old watchmaking practices, craftsmen poured individual attention into each wristwatch.