I've heard guys say FT is easier on the string grooves and overlays, but I've shot tens of thousands of arrows out of old Kodiaks and never had a problem. But for hunting, I only shoot bows that have the marcarta overlays replaced with fiberglass. That paper will give way at some point. Guys who take an old Kodiak with the original macarta overlays out on a two week hunting trip, should be lashed with the string, regardless if it is a FT or endless loop.
A guy can build up the loops of the string with extra strands on an endless loop string as easy as on a FT, if guys are interested in doing that. I build up the loops with some extra strands before serving the ends.
The B-50 in that light tan color is pretty close to Fred's 59 string. I've used that a lot. Actually it is just a little dark. The light tan is neutral and doesn't take away from the bow. For me, white pulls the eye toward the string and away from the bow. I'd much rather have a great looking classic Kodiak with a neutral string than any bow with an eye catching sting... OK, now, remember, there are exceptions to every rule about Bear Bows, the Signature bow has a white, FT string, and was made in Gainseville bow, OMG 3 exceptions...
I have never found that dark burgundy serving so use the darkest red I can find and then lay the bow in the mud every chance I get until the string gets close to burgundy, LOL. Trust me, if the bow goes in the mud I'm already in it.
Years ago I looked into to special ordering some burgundy serving, and was told the minimum order was XX tens of thousands of feet, so that idea was abandoned.
Let me know if you find some burgundy that is close in color to Fred's 59, I'd like to buy a lifetime supply. Hopefully that is quite a bit.