This insulator is a CD 304 top and a CD 310 base that is nicknamed a Coolie Hat. It has faint pressed in embossing; "Hemingray Patent May 2 1893". The insulator is a blue color that is close to Hemingray Blue. It is in very near mint + condition with only 3 drips with flakes off them. There is a factory small raised spot of glass on the RH side and a tiny spot on the LH crown top. This is a very nice displaying Coolie Hat. Priced at $250.00 Plus FedEx shipping cost. Payment by PayPal friends mode or check. More photos available on request. Thanks.