It's hard to estimate value without the photos.
Condition, actual era, rarity all contribute to a valuation. The appearance of the stamped numbers / letter help identify if it's original or something done somewhere other than the factory.
There should be a WaAmt stamp on an original magazine, and it should have never been ground down where the serial number is. I don't know what the number "5" might relate to in your description.
You can get extruded DDR Mags for $85. MegGar magazines for $50. An original like the one Tom pictured, perhaps $125 - $150...
What you have is anyone's guess at this point.
Marc
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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