Could anyone shed any light on the original owner of this one please.

 

Discussed here
https://omegaforums.net/threads/tod...-seamaster-300-“military”.90296/#post-1168637

 

@omegaman answer below from the other thread:

Good old acquaintance, archived that watch before in 2013
Legit: Case with fixed bars, engraving, no A/ matches to the NAIAD crown, dial, hands and bezel are all from 1967
Not so good but could still be legit: missing circled T (quite common for a W10 SM300)
Not legit: movement delivered to Mexico, although the S/N is in the correct range for a W10
So it's a nice military case with a swapped movement from Tijuana