Picked up 2 NOS USGI M1907 slings that were still in their original packaging, one marked MRT 10-86 and the other is unmarked but it's packing slip is dated 7-66. The leather is dyed on one side, but not sealed, and both appear to not have been touched/handled since they were put into clear plastic packaging bags.
How should I treat these slings? I have some clear (kinda milky-white) Danner boot dressing and some Bee Seal Plus boot protector that's yellowish in color, both wax based products I believe, is that the way to go? Also, looking at the picture below you can see one of the slings, the MRT 10-86 marked one, is rougher on its backside then the other, what's the best way to smooth it out like the other sling, can it be smoothed out w/o shredding the leather?
TIA for your advise.