Insulators as follows -- actual postage additional:

U-209 Transposition - great glaze! Incuse THOMAS on the top -- no issues -- $18 (SOLD)

U-600 nice deep blue -- no markings -- couple tiny flakes and a flash-over mark -- $10

U-297 great drippy light blue -- incuse marked V in as rectangle (Victor) -- no issues -- $12

U-297 in a darker (nearly two toned) blue -- Incuse THOMAS on the top -- no issues -- $12