I believe this is a U-923 .. 5" x 3 3/4" .. If I collected porcelain, I'd like this piece! White porcelain, firing rest on the top. Incuse marked on the skirt.

Manufactured by / Imperial Porcelain Works / Trenton, N.J.

See the next photo for additional details. Now reduced $10 to $35 plus shipping !! NO! Go Lower! Down to just $25 ... someone must want it!! Help me get this mud out of my house!!!.