I have this P/L that looks "new" to me but I don't know what it is from. Can anybody help me?

It appears to be ABC (Maybe AAC?)
The bore is 0.871
Sleeve is 1.3/8" long and has an OD of 0.988" near as I can measure it (If I'm doing it right!)
PS: Best I can do is about a 46-51
Is it a Novarossi 50? Rojett 46?