A fine pair of Belgian Pistols

[Relic shooter]

Great find Bayer 1957, we have similar tastes in firearms
Workmanship is on par with LaPage.

 

[Bayer1957]

Beautiful !
What is the flat head screw for in the bottom of the barrel channel near the breach ?

The screw is for attaching the trigger.
On most pistols the trigger is attached to the outside with a screw.
Here they probably took a different approach for optical reasons.

 

[Relic shooter]

Quality antique firearms are an excellent investment & unlike gold or silver you can enjoy using them.
Relic shooter

 

[DOUBLEDEUCE 1]

That again is beautiful !