Well, i don't know how to say this without offending anyone.
For me, it looks like a cheap mechanical wrist watch with a generic asian clockwork (probably by some company called "BTC"?) or maybe with a custom engraving of these three letters.
Worth: probably 5$.
Correct me if i'm wrong.
100% Swiss Made. The movement alone runs between $400 and $800. Search "Valjoux 7750 ETA". This is a "Top" grade movement.