I have read that Astra (Unceta) made both boxlocks and some pretty nice sidelocks. I own an Astra boxlock .410 that is decently finished on the outside (about like a Philly Sterlingworth), but rough on the inside. No markings that I can find to indicate model or grade, but it has a coin finish with moderate coverage engraving, DT, extractor, PG, BT. This one has a cheek piece but no sling swivels. Date code puts it mid-60's, pre-DIARM.