I have used both the chestnut and chocolated drum dyed from Hermann Oak on some gun/Cartridge belts and other projects and haven't noticed any rubbing off tendencies. I haven't used either one on a saddle yet, but I would be very interested in what you determine.
Also, the most recent chestnut that I got from Hermann Oak, was much lighter that the previous sides. Has anyone elso noticed this difference?
Thanks,
Allan