Case back doesn't want to be removed, so movement is an unknown. Case back is dated M3. This one has clean simple lines and the funky deco "12" with all the rest of indices being non-numeric. Crown is an obvious replacement.
Keeps good time as received. Face appears to have toned to a very slight champagne from white.
1963 Surf King "GW"
Ad is from 1964 Linebook BAWDO156