I salvaged coarse leather straps, which drop thin (T2) and coarse (T3) leather sections.
With each kit I salvaged 250 pieces and kept track how often I got which type of leather.
Crude:
184 times coarse (73.6%)
total 314 coarse sections (1.256 per strap)
total 117 thin sections (0.468 per strap)
Basic:
178 times coarse (71.2%)
total 336 coarse sections (1.344 per strap)
total 131 thin sections (0.524 per strap)
Fine:
188 times coarse (75.2%)
total 350 coarse sections (1.4 per strap)
total 112 thin sections (0.448 per strap)
Journeyman:
200 times coarse (80%)
total 385 coarse sections (1.54per strap)
total 92 thin sections (0.368 per strap)
Master:
202 times coarse (80.8%)
total 406 coarse sections (1.624 per strap)
total 79 thin sections (0.316 per strap)