US WW2 Navy Mk IV Gas Mask

In a very good and unissued condition an U.S. Navy Mk IV Gas Mask. The U.S. Navy Diaphragma Mk IV Gas Mask was an updated version of the U.S. ND Mk III, but with even larger triangular eyepieces.  The filter clipped to the head harness behind the user’s head, with two hoses drawing air up towards the eyepieces.  This example was made by Mine Safety Appliances in 1944. Complete with the extrain its original bag, very nice for display!