I dont have the dimensions because the watch is not mine but i do keep track of some interesting vintage watches online.. i posted in wrist scan and Art told me this might not be original.. he said there is a UN collector here who might be able to identif...
The watch would probably have a Valjoux 69 and measures about 30 - 32mm without the crown. The dial is not original. I have a Universal chronograph the same as this one.