Hello and Welcome Daniel!
A 1917 DWM is not uncommon, but still worth reasonable money if all original. If reblued, badly pitted, or mismatched, then it'd be worth $600 for the gun, another $200 for the extra mag and holster.
More than one picture is needed to help, (I moved the picture to here).
If in original shape, not reblued, maybe twice that. I would offer them $800 and see what they say, might take less.
Ed
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