Los Angeles importer. Mine dates from 1972, as does an "Optimus Grade" mentioned in Carder's "Side by Sides of the World" (also 72), although the Optimus is a sidelock, while mine is a scalloped-back boxlock "Eros Grade". Via Google, I find reference to a Philip Katsenes who had several gun patents in the 70's: Recoil damper, trigger sequencer, modifiable stock. Google also connects Katsenes to an outfit called "London Guns", located in either Santa Barbara or Santa Monica. There's a cartouche on the rib where it appears a maker's name may have been removed.

Pretty nice boxlock ejector, single nonselective trigger, ejectors. Anyone know anything else about Katsenes or have any experience with their guns?