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

[peregrinvs]

Thanks. This is how it started and I think that helped bring the price down.
I’ve done the same thing in the past with other dyed black British webbing such as a 1908 Pattern haversack, a 1908 Pattern bayonet frog and a 1919 Pattern cutlass frog.