Most of all the Underwoods that I have seen are ZINC. Maybe post war rebuilds are MAGANISE?
Ok here is a run down of the Underwood T- code.
Reciever Underwood 2,358,XXX
Recoil plate type 3 .U.
Flip site S left side .U. leaf
Flat blued bolt .U., type 1 firing pin .U., extractor.U.
Barrel Underwood dated 10 - 49, type 1 band no mark, milled front site .U.
Slide E - 279 .U., early blued slide stop pin
Trigger Housing stamp brazed BE-B, mag catch type 2 .U., type three safety no mark
Straight Hammer in the white WU, hammer plunger blued, 26 1/2 coil hammer spring
Blued sear .U., tapered sear spring
Blued trigger JU
Stock Hi-wood oval GHD over UEF cross cannon right side, Tremble TN sling slot
2 rivet shallow groove handguard marked M-U
Buttplate diagonial Underwood patternInformation
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