Single Trigger Question?

[Bill Murphy]

Looks like a Beretta selector, maybe some kind of modern retrofit with a bit of aging. Brian is right. You have to look inside.

[John Knobelsdorf II]

Please show the trigger too.

Was it a Parker Bro’s. single trigger to begin with? So only the safety selector is a retrofit? Or was the trigger also modified (from double to single)?

This may not be illuminating, but will make me better informed if I ever come across another that looks like this example.

Also, what era of manufacture? Before or after the 1917 redesigned safety slide was being installed? I am guessing it is post 1917 by looking at the other details (like engraving style).