Porcelain Ponies - U Number Identification

By Bob Toelle; posted August 6, 2014

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I wonder if someone would identify the U numbers for these insulators, left to right.

For these insulators, is the shape enough to identify them, or is it necessary to know the mold lines or pin hole? The second from left has a Locke embossing.

Here's what I've learned ... Thanks!

U-38, U-3, U-42A (Maybe 42), U-11A, U-18, 18A Maybe, U-42B Maybe C