Herb,
A couole of things to look for. These models used three different types of thumb safety levers, the first type is nearly flat and cross-checkered nearly half its length; the second version is raised and cross-checkered, the third type (most common) is the raised and grooved style we are familiar with for all other Lugers. Without looking at my references, the gun you are looking at may be early enough for the first model. You might also see the remnants of a polished area under the bottom positon of the safety lever, indicating its safe position.
How is the bore?
Look very closely at the top of the receiver to make sure that there aren't remnants of an American Eagle which might have been buffed away--straight Commercials are less common.
Old model Lugers are not scarce as hen's teeth, but you don't see them every day, either. I bought one in very similar condition to your description for $700. When I reflect on it, sometimes I think I paid too much for it, other times I think I did OK.
A really choice 1900 will run $2,500-$3,800.
--Dwight
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