1838XXXX
Good! That´s all that matters.
Out of curiousity, it would be interesting to see an Extract for this one
The Seamaster dial on the ones I have owned have had the special Omega logo on the dial, not the normal logo and other index type.
Reviving this thread. Zapatta, I've never seen a Seachero with a dial like yours, but in the late 1950s just about anything from Omega was possible. Here's my 1959 Seachero with a caliber 285. It's a double stamped case 2990/2996.