InvictaMen's 6977 Pro Diver Collection Stainless Steel Watch

Q: how many milimeters is the size of this watch

As other have answered the case diameter is 48mm or 1.89". But equally important to know is that this watch is MASSIVE. It is 17mm / 0.67" thick (vs 13.5mm / 0.49" for many of their other large-body watches) and the straps are 26.5mm / 1" wide. This monster is a STATEMENT.