Winchester '66's & '73's

[Scattered Thumbs]

The guns are in the Winchester evolutionary chain, the 1860 Henry, with a forearm and Kings patented loading gate added is the Winchester 66, move to a metal frame, the lever lock safety (the trigger can't be pulled until the lever is fully closed) and the .45 Colt cartridge you have the Winchester 73.

So calibers not withstanding, the difference between the 66 and the 73 is a solid metal frame and the lever lock safety.  Not careful with the 66  you can fire out of battery.

Which do I have, neither, I shoot a Marlin 1894CB, but I would love a '73. 

Hope this is useful.

Get real, the .45 Colt was a pistol round until some 20 years ago. The original 1873 Winchesters were chambered in .44 WCF, .38 WCF and .32 WCF