Hello, this listing is for an awesome antique. Pocket Watch Sterling 1880′s Hallmarked England London 51mm 77.2 Grams Pair Case Bullseye Crystal as pictured. Nice antique condition as pictured. Outer case measures approx. 51mm across and the inner case measures approx. 44mm across the outside. The inside where the movement sits measures approx. 38mm-39mm and wouldn’t use a real thick movement- approx. Sorry fit cannot be guaranteed. Inner case hinge will need to be repinned after movement is installed. Nice thick bulls eye crystal. Great find for the watch restorer. PLEASE BE SURE TO SEE ALL PICTURES AS THEY ARE CONSIDERED TO BE PART OF THE DESCRIPTION! That would for instance be we state something is 14K gold and is not, we state that something is 12″ long and it is only 8″ etc. Please be advised that some (a small percentage) of our items may be subject to presale in our store.