Please help identify this watch

iosist

The question of authenticity isn't binary, it's a spectrum. A watch case could be authentic but have a replacement movement or refinished dial both of which would be factors in the watch's value. That said, the case and dial look to me to be genuine. If the caseback is removed the movement can be assessed and the reverse side should be engraved with a reference number and serial number which will indicate the manufacture date. Better photos will also help. It looks like an early 1960's Seamaster 30 to me (although I'm not sure they were ever produced with dauphin style hands), but I'm sure more experienced members will have more insight.