Here are seven nice power insulators -- listed from back to front, left to right -- actual postage additional:

Back row:

Large beautiful blue Jeffery-Dewitt in VNM -- $25

Smaller blue JD also in VNM -- $25

Nice early Pittsburg 3-part multpart (also pictured bottom left) -- VNM -- $45 (SOLD)

Front Row: second view below

Nice Lapp pintype -- VNM -- $8 (SOLD)

Tough small multipart -- chip on middle skirt -- $35

small multipart -- small flake under skirt -- $12 (SOLD)

Nice glazeweld fog bowl -- VNM -- $15