Hello Sville,

Yes, thank you. That's it! - Jean Falla,

A reference on "Littlegun.be" indicates:

"...Jean FALLA was a manufacturer of weapons and manufacturer of barrels in Liege Street New Bonne, 35. He used in particular the trade mark and engraved with the serrated roller “head of eagle - Acier comprimé CAP JF” It acted of a steel high strength allowing the manufacture of extra-light barrels..."

And, thank you Kuduae,

for this information,

"...That mark is indeed the mark of the barrel maker Jean Falla for Cockerill compressed steel. ...I found this ad in the Gadisseur & Druart book..."