Hi, and welcome to the forum. The general advice about leaving it as is makes sense. There is some collectible interest if it's in original finish, but that is lost after re-bluing.
.30 Luger is less of interest as a shooter because of the higher cost of ammunition. That said, it's a great round.
Military Lugers have much more collector interest. That is why they are more valuable.
If you got this for the equivalent of $560, you bought it about $200 below market. The other way of looking at it is that your Garand cost the buyer about $1040.
Now that we know it was refinished, drop it's value back to $450 to $550.
Marc
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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