ST-6800A: USA
diameter 10" (255mm)
(incuse) "date" (cap embossed) J.D.CO. / DETROIT // PAT. PDG. {Pittsburg for Jeffery-Dewitt}
Picture courtesy Mid Norris |
diameter 10" (255mm)
(incuse) "date" (cap embossed) J.D.CO. / DETROIT // PAT. PDG. {Pittsburg for Jeffery-Dewitt}
Picture courtesy Mid Norris |
Note: Made to US Patents 1,329,7700 Feb. 3, 1920, 1,716,963 June 11, 1929
This version was made for Jeffery-Dewitt by Pittsburg High Voltage and has the associated date stamp. The story behind this is that J-D had a large order for the standard ST-6800 styles but could not meet the demand so had PHV help with the order. Many of these have the typical Pittsburg date stamps. They are known with no markings on the cap as well.
Original ST number assignment by Raven Kotlarsky and Steve Coffman
