A gents boxed Bulova wrist watch, 1957.The watch has a chronometer grade movement, calibre 10BP, which is working nicely. This calibre of movement was made in the US from 1950 until 1960 and is a highly adjusted movement with five adjustments plus hot / cold. The movement is also stamped with the word isochronism which means that a balance that takes the same time to complete a swing no matter how big the swing is, has the property of isochronism. Although not officially certified as being of chronometer status, the quality is certainly there and would no doubt have been certified as such had it been Swiss. The movement is fully signed and the date code dates it to 1957.The watch itself measures 32mm diameter excluding the lugs and the winding crown. The case is 10k white gold filled and it is in good condition. The date code on the case is 1958 so that ties up nicely with the movement as we would expect a slight variation as the movement and cases would have been made in...