Here's an attractive PAT'D embossed aqua glass mine spool shaped threaded CD 187 (patent other) insulator. Has nice underpour on the back side and several scattered fleabites and hard to see small crack.

First email gets this historic spool for only $15 plus postage or get it free when you buy the beautiful emerald green threaded mine/duplex glass insulator offered for sale at the slashed price of only $100 [id=333997672].