Thanks guys.
I think all my Barnacks have vulcanite; none have that "vertical-grain" like Roland's sharkskin II.
I was curious about my 1934 III 1366XX (chrome); the coveirng is lifting a bit at the bottom of the lens-mount, and to the left, and has a slight brown-ish sheen on the wear-surfaces, which made me wonder if it was animal-hide losing its suface finish.
I keep my LTMs in an everready case when I'm shooting; the vulcanite does feel a bit slippery on its own.
Regards,
LF