U.S.A., U.S. Flaming Shell Seal

USA, Flaming Shell or Granade or Bomb Ordnance Seal, Image & Found by Donnydave.
Found in Full Sutton East Yorkshire, 14mm.

Lead seal with U.S. on one side and a flaming grenade with concentric circles bisected with a vertical line on the other. Rusty wire attachments are evident.

See US metal ammo boxes with this marking on them. "The “flaming bomb” symbol of the Army Ordnance Corps was present on most WWII ammunition boxes."

See U.S. Army Ordnance Corps, branch insignia.

From Encyclopedia of United States Army Insignia and Uniforms By William K. Emerson. "The grenade device has been traced back as far as 1704 ... It was not until after ... 1851, that the historic insignia became used primarily by the Ordnance Department."

Ian T. located the following information - ORDNANCE DEPARTMENT LEAD SEAL HAND PRESS – RARE EARLY TO MID 20TH CENTURY INSPECTOR’S TOOL - MC Pheeters Antique Militaria "this United Seal Company hand operated Hot Press Tool was used for clinching lead security seals that were placed on packing crates and containers to prevent tampering and theft. Each of the jaws is fitted with an emblem discs to emboss the lead disc on the seal - one having 'U.S.' and the other has the Flaming Bomb insignia of the U.S. Army Ordnance Department." See link for images.