Unmarked type 2A mag catch

Anybody ever come across, or have any info on, an unmarked type 2A mag catch? I have one in a Rock Ola trigger group. Type 2 housing, type 2 safety, type 1 sear, type 3 hammer(B/R circled, in the white), Rock Ola trigger. Can't find any marks on the mag catch at all. Finish matches the rest of the group. Its not a type 3 milled down.

Since the harrmer doesn't fit with a type two trigger housing the magazine catch could have been replaced also.

Funny this post came up, i just got a 1.58 QHMC that is all original except for cut sights, and it also has an unmarked type 2a mag catch

Is the finish blued?

Early IP's had unmarked mag catches also