alex350gt

Hello, I recently got this from a garage sale and was wondering if anyone could help me authenticate it. and what it would be worth? The sword has definitely seen better days, and the sheath is rusted. I saw a similar one on ebay for $500 but there was numbering on the sheath where it meets the sword. But Mine does not have that on the sheath, just numbering on the sword. Any help is greatly appreciated. Thanks,