Siebe Gorman Vista Vision Mask
The Siebe Gorman Vista Vision Mask featured a large curved triangular window with central speech diaphragm and inlet. There were many applications, including SCUBA, rebreather, and the "Puretha" filter. This example has a corrugated hose that would be connected to a supplied air system, and was made by Siebe Gorman around 1960.
Similar masks in my collection: N/A
Manufacturer stamp on forehead "SIEBE GORMAN OF ENGLAND VISTA VISION"
Manufacturer stamp inside mask "SG"
Filter stamp and sticker top view "130587" "Remove bottom seal before use"