By the way, for historical reasons I just had to revisit the identification of the mark on the barrels as "Lovinfosse Hardy François et Fils." Here is their their mark registered in 1909
Deux fusils croisés avec étoiles et les initiales FL est la marque du fabricant François LOVINFOSSE-HARDY rue Hayneux, 76 à HERSTAL. Cette marque a été déposée le 15.07.1909. L’intéressé a été actif dès 1876. Il est l’auteur de 2 brevets déposés en 1876 et 1885 (voir site).
Two rifles crossed with stars and the initial FL are the mark of the manufacturer François LOVINFOSSE-HARDY street Hayneux, 76 at HERSTAL. This mark was registered the 15.07.1909. The interested party was active since 1876. He is the author of 2 patents deposited in 1876 and 1885 (see site).
Lovinfosse-Hardy François & Fils qui utilisait la marque FL couronné entouré de deux fusils croisés (voir site)
http://mallorquina.pagesperso-orange.fr/source/pageH.htmPre 1909 they used two marks...FL and FL in a circle: "vers 1865 signature "Hardy et Lovinfosse" voir Lovinfosse. la sucession des noms laisse a penser que Hardy et Lovinfosse étaient associés et que deux enfants se sont mariés pour donner la dynastie Lovinfosse Hardy puis Lovinfosse Hardy et fils .." (
Référence 1864 signature "Hardy and Lovinfosse" i.e. Lovinfosse: The union of these names leads one to think that Hardy and Lovinfosse were partners and that the two children were married which led to the dynasty 'Lovinfosse Hardy' then 'Lovinfosse Hardy and Sons'.")FL Lovinfosse Hardy and Fils (François)
FL in a circle Lovinfosse Hardy and Fils (François)
http://damascus-barrels.com/Belgian_Trade_Marks.htmlNone of these marks resemble the marks on the Zavattero guns above...so..unless someone can come up with something better, I'm reverting to the original conclusion...that this mark is ZF in a circle and is a Zavattero Freres mark.
Neitir mentioned that in 1962 there were two models FOCOR and FOCOR standard. He didn't mention CYNEA. However from his description believe his "FOCOR standard" was CYNEA. He also did not mention the ZF of ZC stamps.
However, if I'm right, then on this point he is 100% correct which eliminates the dichotomy noted above.
"All the guns of Zavattero freres were equipped with either Belgian barrels using the Belgian mark or Zavattero Freres barrels marked "ZF"." In which case these are in-house barrels manufactured by Zavattero Freres. So until proven otherwise (and welcome additional information), believe this mark is the Zavettero mark put on "ZF" barrels.
And by the way the original catalog I posted from about 1912 had a lot more models than CYNEA and FOCOR.