Oddball Pittsburg signal. Can you identify the U-number? Pic 2

By Colin Jung; posted March 9, 2020

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It is 3.5 inches tall, 3 inches wide at the base. Has no markings. Skirt straight up and down, double petticoat, recessed inner skirt, the outer skirt is the firing rest, unglazed pinhole with just a faint circular impression at the top of the pinhole, wire groove seems wide for a baby signal and almost square in profile. The lower portion of the wire groove is like a flat shelf.