U-197A: USA
3 1/2" - 2 5/8" X 4 3/8" (88mm - 66mm X 111mm)
(base embossed) MACOMB [dry process] {Macomb}
Picture courtesy Elton Gish |
Note this is a two part glaze-weld -- this version is only threaded on the bottom part to avoid alignment issues.
U number assignment by Jack Tod.