Recently purchased a W. J. Jeffery hammer 12 ga. Serial 8468. Underside of bbls is stamped "2 3/4 case" and on topside one barrel has address engraved while the other the inscription in the subject line. I found Cornell publishing has a Jefferey 1904 catalogue reprint mentioning this steel. Anyone have further details on Herakles compound steel? (BTW, has a swamped rib going by the definition in the recent thread)