Can anyone identify this 1991A1 grips safety?

[JoyfulJoker]

I posted this elsewhere , but got no responses.

Please excuse the large pics...
I have a grip safety on an Ithaca Frame Arsenal rebuild with worn out vertical serrations. All the ID pictures I look at have smooth grip safeties. The tang is not as round as an Ithaca. I'm wondering if it is a commercial part.

Does anyone have any insight as to what kind of grip safety this is?

Thank you. I know the mainspring housing is a Remington Rand with 8 ribs.

[JoyfulJoker]

I got a thoughtful answer elsewhere.

It's a Union Switch and Signal Part.

[M1A Rifleman]

check the cool gunsite 1911 webpage as they have details and pictures of oem parts as issued from the various manufactures.

[JoyfulJoker]

Thanks to the folks at the CMP site. As stated , it's a Union Switch and Signal Grip safety.

The shape of the tang is the same as the US&S. It's just worn out and those are machining marks.

This is a Union Switch and Signal grip safety in much better condition. It's the same.