Hello Ed,
I am guessing that Raul's 1900 luger is a 1900 commercial, since he only mentioned a "DWM" marking on top. A serial nubmer of 16220 also can place this gun in the the right range (of # 50-# 19627) for a 1900 Commerical, according to the table on page 11 of Jan Still's book, Imperial Lugers & Their Accessories".
Value always depends on condition and my 23rd. edition of the gun Blue Book shows a price range from $ 3000 for a 98% condition gun down to $ 950 for a 60% condition gun. These prices might be a tad low, as I have not purchased the recent 24th. edition.
Regards,
Pete... <img border="0" alt="[typing]" title="" src="graemlins/yltype.gif" />