Here we have a vintage Benrus mechanical wristwatch in a 10k RGP case with a stainless steel back. This timepiece is great condition with featuring a stunning tropical dial. Case measurements are approximately 34mm wide x 40mm from lug end to lug end. The back case is sealed with no sign of an opening notch and therefore I was unable to open it to photograph the movement. However, the watch was set, wound, and appears to be keeping good time over a 24 hour period. The back case reads: Waterproof, Shock Absorbing, Dustproof, BENRUS 435648m Pat.2,302,340, 10K.R.G.P Top-ST.Steel Back. *NS