That's a heck of a find for 2GBP! July 1969 Proof/Proof with the hacking 6105B movement. You should have a really nice watch after a service and a new crystal. FYI: Spencer Klein sells correct replacement crystals that exactly match the OEM spec.
My Willard from 1972. Hasn’t seen much action. Came with original waffle strap. Not my birth year, however ironically it was my Selective Service Draft year.
I’ve been looking for Slim but haven’t found one yet. They are a bit more complicated to figure out the options. @Dan S posts from his collection have been helpful