Insulators as follows -- actual postage additional:

U-821 great deep butterscotch -- inkstamped LAPP 5839 -- no issues -- $35 (No longer available)

U-627 (sim) great blue! incuse THOMAS on the ear -- one tiny nick -- $12

U-2237 from Canada -- ink stamped NP-54 (National Porcelain) -- $8 (SOLD)