Prexems 4 inch Crescent style. Never seen another with this name.
I had never seen one either.
Charity shop find a few weeks ago.
Mfg. by Ets. Vernet, Bondy (Seine), France.
Probably made in the 1930s or 1940s, apparently for export.
Marked: 12 INCH PREXEMS
Reverse: DROP-FORGED-STEEL
With right-hand knurl.
Henri