D.R.G.M indicates it is German made.http://www.wehrmacht-awards.com/forums/showthread.php?t=186714
"FOREIGN" might have been a required marking for import in that time period.
I tried translating "Coñac Oxigenado" from Spanish...got "Become oxygenated brandy" or "Oxygenated cognac"
These wrench-knives were made in Germany, with several old advertisements for them I've seen from the 1950's. (see below) It is possible that they were first made before WWII, but I haven't found any evidence of that. Many which turn up in the USA are stamped Hoffritz, or Voss Cutlery. Both companies were importers and had retail outlets in New York and distribution to the rest of the U.S.The ones that were stamped "FOREIGN" seem to have been imported by countries other than the U.S. I've seen them listed by eBay sellers from the U.K. and they are always stamped FOREIGN. Perhaps it was a law back then in some countries, to distinguish imported items from domestically-made items?As regards Coñac Oxigenado, it was almost certainly a brand of spirits that was available at the time, and your wrench-knife was an advertising premium. Apparently the practice was quite common back in the day. I have other knives in my collection stamped Moët & Chandon, Dry Monopol, Sparkling Champagne, etc. In my opinion this adds to the value of the item, not detracts.Bob (Image removed from quote.)