Gary, I frankly think that the last place you will find accurate information about specialized Lugers like the Krieghoff and the Navy variation of Lugers is a local gun show, unless it is specifically oriented to collectors and some Luger experts will be there.
If you're pricing them to sell them, these online forums can help more, since people have deep expertise (like Norm above). If you're pricing them for insurance, look at sites like Legacy Collectables and Simpson's Ltd to get retail prices.
You will need well exposed detailed photos to get help online.
I honestly would not bother taking anything like you have to a general gun show. More risk in it than benefit.
Marc
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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