Funny you brought up the subject, I too have a 1915, Colt 1911 looks just like yours, has two tone mag w/loop. Inst booklet, now mine has one small problem, someone took an angle file and placed three small notches (/\) on the bottom side of the mag well, ol dude I got the pistol from at the gunshow (Trade) said his grandfather (and he was at least 65) was with Pershing down in Mexico and shot three Mexicans with it, thats why it was notched. COLT can only tell me it was shipped to El Paso TX in 1916.
The PBS channel show "History Detectives" wil be in town this weekend and I will drop by and show it to them.
($2000 is a bit low I think for the pistol showed, more like $3,500) IMHO.