Capital letter "W" stamped on 69 Camaro heater delete plate

[69RALLYSPORTZ28]

I am looking at what is represented as an original GM heater delete plate for a 69 Camaro and I noticed a Capital Letter "W" stamped into the metal
If not a restamp, is this one indication that the panel is original GM?

[68camaroz28]

Not sure but similar supplier stamping on transmission drain plugs. Not uncommon to note suppliers made several parts for GM but again can not confirm.

[Northernforce]

I would say real gm piece-the "W" is the manufacture stamp(brain fade -don't recall which company)-I have that W stamping on my cowl induction air cleaner flange.Stay safe everyone!
Happy Easter
Keep on Cruising!
Dave

[L78racer]

W is on fan blades too.

https://www.youtube.com/watch?v=r97Nv8N7-mI