[ithacaartist]

It's an "Alphabet Commercial, all right. Finish looks original, seem in good shape. Unless I've missed it, you didn't mention its caliber. A .30 Luger is usually worth somewhat less than a 9mm because the ammo is significantly more expensive than the 9mm.
From what I can see, think in terms of slightly under a thousand, to somewhat over a thousand dollars. Commercials also go for less because they lack the wartime connection and mystique. If this is an all-matching gun, it is collectible because of its good condition, and you may want to avoid making it work for a living.