Please forgive the low-quality cell phone pics, but here are the two LHS pipes that were included in a large estate lot that I won a few months back.
The lower one is a Warwick:
And the upper one is a Purex Superfine that's been customized:
My weak google-fu has revealed that UMWA 50 is United Mine Workers of America District 50 formed in 1941, and 13013 represents the union-established starting salary.
I don't know when I'm going to be able to get to cleaning these up, there are at least two or three in front of them and time is a commodity I have little of these days. When I do, I'll be sure to post after pics here.