James,
As you can see, there can be quite a bit to learn before buying a collectible Luger.
The ones you have been looking at on the Auction appear to me to have been selected because they are less expensive. If so, you've learned that there is always a reason.
Those of us on the forum put in quite a bit of time studying the subtle markings and variations of Lugers. While you can sometimes find an under-priced collectible Luger "out in the wild" it's unusual to find them on Auction sites.
You might be better off putting a "Want to Buy" post here on the forum. Members here sell from their collections every so often.
We can also help you enroll in "Luger University" if you'd like help studying about them. The books may seem expensive, but they are a bargain when you consider the cost of over-paying for just one Luger.
Marc
__________________
 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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