Nice G date luger Rich. It's the 3'rd variation of 6 variations of the G date luger... see Frank's sticky...
http://forum.lugerforum.com/showthread.php?t=22680
#9876 should have an "a", "b", or "c" suffix for this variation... script letter at the front of frame below the serial number as Clark mentions.
If the gun has one or both matching mags that adds value. To be matching, the mag bottom would have the same serial #, suffix, and droop wing eagle 154 proof. A matching second mag, in addition, would have a "+" sign on the mag bottom. IF the gun has both original matching mags, and the rest of the gun is all matching inside and out and all is correct, then you're probably somewhere around $3500 just for the gun.
I'm sure the real experts here will add/correct as necessary.
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I'm looking for a D suffix DE154 G Date mag. The closer to #457d the better

PM me if you have one you are willing to sell, trade, or if you have a lead