Here's a possible U-681 porcelain insulator that is unmarked but has all the indications it is made by Pittsburg. Measures 5 1/2 x 4 1/8 tall. Drippy black and dark brown glaze. Small spot with light scratch marks and small spot where glaze rubbed off, otherwise MINT. The profile matches U-680C better than U-681. Recovered from Mountain Power lines in Washington during upgrade.

First email gets this cool porcelain unipart for only $20 plus shipping. Thanks!