Here I have for trade a blue U-384B (NN Thomas) and a Brown U-392 Minnie Mouse (NN Pittsburg). Both are tough pieces to acquire. The U-392 is mint. The U-384B does have a chip on the ear which can be easily repaired. The U-384B is not as dark a blue as the picture shows. It is more of a medium blue as shown in the below link.

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I will consider offers of both glass or porcelain as I collect both. Will also consider foreign insulators.