I am by no means an expert on Spanish doubles, but they did get a bit of a reputation for low quality on some models in the 50s and 60s since some sellers here in the States ordered them to a low price point. But now they have some great quality boxlocks and sidelocks at thousands less than their English counterparts. I know there are some much more knowledgeable people here that could give you some more insight if you can find a camera to photograph the marks and gun.