The diameter is 49 mm and the case with movement weighs: 66 grams
pocket watch but a Union Ancre, trade name of the Amsterdam watchmaker Henri Julien. This is a pocket watch imported by him and sold under his trade name (dial). As far as I can see the hammer without handle has the number 121. This means that the pocket watch was made by Guillod & Co, La Chaux-de-Fonds.
Pocket watch in 14 kt (585/000) solid gold, in very good condition, movement runs perfectly, dial in very good condition. Watch has inscription on the dust cover for 25 years of service,