Pre-WWII web slings, common, uncommon, rare or unobtainium?

[browningautorifle]

Other people have reported having to bootpolish it black.

Our own guys of The Queen's Own Rifles had to webbo and boot polish their '51 pattern webbing until they were issued the "New" '64 pattern stuff. Then we were still issued the '37 pattern rifle slings through the '70s also until the C7 rifle issue mid '80s. The slings were black or tan or even blue toned...but we didn't care. I don't recall any special markings regarding this threads direction.

[Mk VII]

I can remember us having to boot polish the slings for a formal parade (something we didn't do much of) and I bought in a buttonstick and did the brasswork on mine as well.

[muffett.2008]

Ravens oil was used to blacken the slings, then boot polish to give a shine, later on a laquer was used on both webbing and boots.