California Glass Guidance: RT and PT Mold Types for California Ponies

By Colin Jung; posted March 15, 2006

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The two pony mold types were first formally identified by Brent Burger in a December 1980 Crown Jewels article on California glass. Displayed here from left to right: RT (round top) C.G.I.Co., PT (point top) C.G.I.Co. RT California, PT California.

Note that the PT mold type has a distinctive tit of glass on the dome.

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