By the serial number on the cylinder you've likely got a 1905, 4th change. What is the SN on the butt ? Don't let the pictures throw you off. the picture showing 2nd target is NOT a target. The one showing 1st model is a US Army 1st, not all first models have the cartouche on the stocks. Could be in square or round butt depending ...
Sal,
It's a Target, just not a great photo. Check the photo in SCSW-3 Pg. 137 and the front sight as well.