These were apparently made by Orbea Hermanos of Spain and marked "R.M." with a sunburst. Here is one for sale:
http://www.collectorsfirearms.com/ad...p?itemID=22904
I've never heard of these and would like to learn more as I think I own one! The "R.M." and sunburst have been scraped off of mine and someone replaced the grips but I have the same type of number (not the serial number) on top - Mexican army number perhaps?
Anyway all comments, opinions, recomendation and help would be appreciated. Thanks!
John