A great thred, a lot of nice combos here. I'll add some more to the mix.
A 1st model American with an 19th century folder.
Here is a New Model No. 3 with an early Marble's Safety Knife.
Registered Magnum with a period Marble's Ideal knife.
A Pre-Model 34 Kit gun with a period Marble's Woodcraft knife.
A Model 27 with a period Marble's Longhorn knife.
For good measure a Colt Model 1902 Military with a period Marble's Safety Knife.