Picked up this Westinghouse U-314 with incuse "W" marking on the dome. Seq. No. 1693 in the "Value Guide by Elton Gish" does list a U-314 with no marking, but as of yet no listing with an [inc.] "W" on dome. I am also showing a P.P. U-293A [inc.] for comparison. Second picture will show the incuse "W" marking on the dome.