Base embossed with AM. INS. CO. PAT. SEP. 13,1881. A quarter inch flat base chip takes out most of INS. There's a quarter inch upper wire groove chip. Number 4 on the dome. Otherwise, sparkling glass in blue with just a tinge of aqua.

First email gets it for $28 shipped in the lower 48. Insurance extra. PayPal friends preferred. Money order okay, but it will delay shipping until I cash it.