why2kmax
Jacka$$
I believe so.
These were retro-fitted to older frames sometimes when they went through arsenal refurb.
I'm not a post-war P1 expert but I think they became standard well after 1964 (same with the "fat" slide).
BTW - There is a lot of argument about whether "all" P1/P38 are C&R or only by date.
No ATF ruling on it being "all" and they are not on the lists.
http://www.waltherforums.com/forum/faq-classics/20702-p-1-questions-fat-slides-hex-pins-3.html
second post down shows a lot of pics comparing an earlier post-war to later (hex & fat slide vs not).
Thanks for the info. I have one P1 without the hex pin and its a good shooter but wouldnt mind another