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I think your mark is "EIG", which was an importer of generally inexpensive (not high quality) firearms for many years. They are (AFAIK) out of business now. They imported many "Saturday Night Special" handguns as well as some sporting rifles and shotguns.
The 8620 is a serial number. The shields with X and knights helmet are Spanish proof marks, as is the crossed gun mark.
If your gun works, it is a shooter and suitable for any type of hunting for which a 20 gauge is appropriate. It has no collector value. Value/price would be in the $200-300 range, assuming that everything works. Any major parts breakage would problably not be economically repairable.
The "GMOS" may refer to the actual maker, but it is probably an assembled gun with no one willing to actually take credit.
Jim
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