Jerome, I've been looking/figuring for years on how to modify/adapt those early Coleman appliances to propane. I have (somewhere in the barn) one of the early Coleman, single mantle, butane lanterns that used the 'push-in' cartridges. Also had one of the pink label 'picnic' stoves but was never able to find fuel for it so finally sold it at a yard sale a few years back. I looked at the adapter kit that Darren linked & it might work OK with the current butane cartridges. We have one of the single burner butane stoves in the TD & it works great (even at high altitude) for the first 2/3-3/4 of the fuel then the flame kinda dwindles. Dunno how the adapter works as the butane current butane cartridges need to be held tightly against the feed tube & I don't see a way to do that unless the 'tabs' on the collar are a kinda 'twist-lock'?? The current butane cartridges are also kinda PRICEY!
I'd want to use a flex-hose connector so the weight of the 1lb cylinders don't change the stability of the stove/appliance if I were able to find/fabricate an adapter for the old Coleman stuff.