Robin; Can't figure out,how you "can't figure out",if it is an Army Special!!
Army Specials are marked on the barrel,"Army Apecial". They were available with a 4" bbl. Serial numbers start at 291,000 in 1908.
Before that,the 1889,1992 etc. Colt Army and navy "left wheelers start the serial number range. They are marked "Colt D.A. 41" on left bbl. side. They had a 4.5" bbl.(unless yours had been "cut" from this,or a 6".
Most noticible,besides the "left wheeling",old style action isa) side plate on "wrong side" b) the trigger guard is indented from the rest of frame.
So,I take it,the gun must aftermarket stocks???
Hope this helps; a serial number will be of better help(on the butt if it is NOT an Army Special)
Bud