Martin Ugarteburu Daryl
https://www.shotgunworld.com/threads/m-ugarteburu-shotgun.560867/

Cornell Pubs has a 1947 catalog repro
https://cornellpubs.com/product/3817/

H*1 is 1962

Can't tell if the engraving and gold on the top lever is the same as this 110
https://www.gunsinternational.com/g...2-bore-ejector.cfm?gun_id=102145022#lg-2

Mlo 124 may be Modelo (model)