I have been going through my shelf of old parts and came across this power brake booster check valve vacuum fitting.
In searching online it looks like a 3420128 for a Bendix booster for 70 & 71 HEMI cars?
I have attached some pictures and the last one is a close up of the logo.
I would like to know if this is an original factory part?
Thanks!

having kept many of those check valves over the years "just because", after looking for them, they must be in a "safe place", because i can't find them ! [gee, imagine that ! ]
however, after saying that, your valve looks like some i have pulled from mid to late 70's C-body's.
unfortunately, as i can't find my stash of those valves, i can not confirm the cast in lettering as being a factory part.
so just consider this as a bump, so others with more brains than i possess can confirm or not your part is a factory item.

moparx,
Thanks for the bump!
I have decided because of the lack of responses I will put the check valve back on the spare parts shelf.
The next time I go to a high level show with HEMI cars in attendance I will bring it along and see what I find on them?
MJ