The screw you refer to is very clear in Pics 4,5,6. This is a Black Powder frame we know this by the date and Ser.# This is a First Gen Colt. I am interested in the orginal Denver Dbl. Loop holster. These holsters are correct to the pre and early post Frontier west . The Frontier was closed in 1898. These holsters are valuable on their own. Does the holster have a makers name?