Breguet - Breguet? I don't know

Breguet? I don't know

Hello for all,

I have a pocket watch with the case Breguet there are 2 nunbers, a external JBB 420.869 and internal B.B.7 420.869.
The movement isn't signed, well I can?t see anything.
In dial there are "Doris Watch".
The diameter is 55mm without crown.
If anybody know anything about it, please let me kown.

Thanks a lot,

Paulo