Original U.S. WWII USN ND Mark IV Diaphragm Gas Mask Converted to Shallow Diving Respirator Spanish Ordnance minus an inspector’s mark on

minus an inspector’s mark on the back of the swivel

The left side of the frame is marked CALIBRE / WINCHESTER next to 1873 under the cylinder

especially the eye-hole covers

The photograph measures 5" x 7"

) The AC was now in a wind-up tight spiral and came back to the Baltic shore

Original U.S. WWII USN ND Mark IV Diaphragm Gas Mask Converted to Shallow Diving Respirator Spanish Ordnance minus an inspector’s mark onOriginal Item. One of a Kind. This is a very interesting example of the U. S. Navy Diaphragm Mk IV Gas Mask, which has the canister entirely removed with a new tube and valve attached for attachment to an oxygen tank. Additionally, the vent on the front has been entirely closed off, so that the mask could be used for shallow diving and likely ship repair. The U. S. Navy Diaphragm Mk IV Gas Mask was an updated version of the U. S. ND Mk III, but with