A mystery: help identify this trigger housing

[GeorgeP]

This housing has been in my spare parts stash for years. I was never able to determine the maker so it was never used on a project. I have been digging though the stash figuring out what I can get rid of. It has all the features of a Type II. Beveled rear lug , flat rear wall and flat front.I reference the Riesch book 5th edition.
The markings on the right side are poorly struck. The picture shows it well, I don't think it looks any better in person. What may identify the contractor to some one of you is a very nicely struck number twelve on the bottom and also an A over on the left small space next to that.
Maybe one of you who have access to The Carbine Club newsletters might have info on what contractor these extra markings might be attributed to. I sold off most of my collection , so I don't have any examples here to compare it with.
Right now I am leaning towards Quality Hardware or S'G' .

Information

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[BrianQ]

Winchester

[GeorgeP]

Winchester

I had first considered Winchester . The lack of a small w and the round shaped markings steered me away from that.My brain cells have sort of reactivated and I do agree it is most likely Winchester. I now recall that they often have the numbers stamped on the bottom.It is hard to retain all this carbine knowledge when you are no longer actively expanding your collection and participating in the discussion . Also after I read your reply, I discovered that the carbine club new web site is up and running. It has a vey good page on trigger housings, and specifically mentions numbers stamped on the bottom of Winchester housings. I doubt any one will want this housing for a restoration because of it he lack of a clear w mark.

[jimb16]

Look inside at the hole where the safety arm of the trigger goes through to the safety button. Is it a nice oval or is it more like a 3 leaf clover? If 3 lobed, then it is definitely Winchester.

[tenOC]

You'll often see an o stamped on Win parts too. I've read it stands for Olin.
The more important issue for collectors is the finish and machining marks present on the part. Looks like it's refinished?

[GeorgeP]

The housing has the clover shaped hole in it. Yes it is refinished. I built it up with mixed parts for a shooter grade carbine. I probably took it out of a carbine years ago that I was upgrading to correct parts. If it was marked W I would offer it up for sale. Thanks for the replies.