Help IDing Gabby Hartnett pin
 

Odd pin, looks like a NY hat which puts him with the Giants in 1941.
I assumed a PM10 initially but the only one he has listed in the SCD is with the Cubs.

The back has a stamped impression: J.W.U. at the top
an odd logo in the middle
#31 under

Any help appreciated

Bob

I never noticed this until I saw your post, but it looks to me like Gabby is wearing a 1933 National League All-Star cap. I'm not sure if any other all-star team ever wore these caps like these.

I suspect this is the common PM-10 with the Cubs you referring to. It's a pretty easy pin to find.