You can access photos of the Colt 1905, 1907, 1909, and 1910 .45 ACPs at Sam Lisker's Colt Automatic Pistols Homepage
www.coltautos.com . Even the 1910 pistol shown on his page lacks a thumb safety. However, as mentioned above, all of the military trial pistols starting with the 1907 Contract type had a grip safety...so much for the often made assertion that J.M. Browning meant the design to be carried cocked-and-locked and that the grip safety was a last minute 'superfluous' addition.
If you wish to read more detailed information about early Colt semi-automatic pistol designs, find a copy of Donald B. Bady's
Colt Automatic Pistols, preferably the enlarged revised edition of 1973. It is out of print, but used gun book dealers often have them in stock.