Comments:
Either ref 2576 . . .
. . . or possibly 2518.
[ref OJ 2518]
[ref OJ 2518]
I owned a two-line ref 2576 for a brief spell but the person I bought it from wanted it back. Shortly afterwards he sold it to someone else; wish I still had it!
These bumper Seamaster chronometers are tops in my book.
Art