As far as I know the importer in question, Kassnar Arms, has been out of business for quite a while. According to my books, Larranga was most recently imported by Toledo Arms. They made backaction sidelock, sidelock, and boxlock actions. They all came with engraving from light to fancy, with double triggers and checkered wood. Basically everything from utilitarian to fancy.
Can't help with current pricing but origianl pricing in 1950 was from $US34 to $US90.
Just a hint though, when identifying a firearm on a public forum, you should x out the last couple of digits in the serial number (#923xx) for the owner's security.