Here's a rarely seen set of small glass insulators (possibly exported from France) to Belgium. They date to the period 1928 and can been seen in an early French electrical supplies catalog [id=330749355]. The example in this link are made of porcelain and they are identical to the glass ones I'm offering. Measure 1 inch wide x 3/4 inch tall. Embossed: BTE S.G.D.G. No.1. (translates to patented without government guarantee). I'm aware of about 6 of these recovered in Belgium.

Each insulator is in VNM++ condition with base pontil where they appear to have been removed from a mold. Colors offered are Green, Aqua and Lime Green. For close-up [id=350922348]. First email can get all three for $150 plus shipping or $58 each.