Insulators as follows (left to right, top to bottom) -- actual postage additional

U-2421 (Canada) no markings - awesome light blue drippy glaze - no issues -- $10 (SOLD)

U-297 (USA) no markings, no issues -- $6

U-2571 (Canada) no markings, great color, no issues -- $8

U-291 (USA) no markings, cool pattern on dome! Thomas? no issues -- $8

U-270 (USA) no markings, Pittsburg product, couple small base flakes -- $10

U-270 (USA) no markings, Pittsburg product, tiny inner skirt chip & a couple pings -- $10

U-2377 (Australia) no markings -- no issues -- $8

U-2377 (Australia) no markings -- no issues -- $8

sim U-466 (skirt ink stamp) CHANCE, no issues -- $8

U-447A no markings - nice early piece! -- $15

U-297 (USA) no markings, no issues -- $6

U309 no markings, one tiny ping -- $6