One thing to consider is whether you want your M1860 to be worn butt-forward on the right side, cavalry style, butt-rear on the right, or crossdraw on the left side (presuming you are right handed. Also, do you want an open top holster, or with a half- or full flap for protection from weather. Slim jim's were the predominant style until the mid-1870's or so. Interestingly, the Pattern of 1863 military holster could handle the Remington New Model Army, the M1860 Colt's Army and by chance worked just fine for the Colt's Single Action Army when it was introduced. The military holsters were black, and many of the civilian models were as well, although they could be brown.