Here's a pair of teal CD 121 Brookfield insulators, both have amber stringers in the the glass and shop number 12 on dome (with backwards 2). These came out of a collection in Seattle, WA. Most insulators in this collection were used locally. The one on the left has a 1" base flake. The one on the right has 3-4 tiny tic marks and a factory shallow small open bubble on the base.

First email gets these odd ball tolls in a color that stands out next to a regular aqua for only $35 plus shipping. Note: these are not teal blue, but a straight teal color leaning towards teal green. Thanks