Not insulators, but insulator-related. I visted a couple of flea markets and yard sales this week, and while it was pretty light for insulators per se, the go-with hunting was VERY productive.
On the left is a mint light aqua WATER bottle with HEMINGRAY embossed on the base, and PAT APR 5 1932 embossed at the bottom of the front. This was a patent for the wishing well bottle design, as shown here: http://reference.insulators.info/patents/detail/?patent=D86659. Is this a late date for a "Hemingray" marking?
On the right is a minty light blue (is it Lyndeboro Blue?) demijohn with an applied screw top finish embossed with Samuel Oakman's Feb. 27, 1877 patent date. The patent info is shown here: http://reference.insulators.info/patents/detail/?patent=U187725. Dario had several of these on display at the last Yankee Pole Cat Insulator Club show (most of his had caps, though): [id=495810927].
Thanks for looking. Inquiries and comments welcome.