Later models had plastic windows. Window frame is missing one small screw, (also, 5th photo). Stamped above window 385, and then with a four digit serial number 4636, (photos 3 & 4). Approximately 22"H x 12"W x 14 front to back. We have another similiar hat in our collection, converted in to a fish tank!
As with all dive equipment, this helmet should be inspected by a professional technician before use. 12 photos are a part of this description. This item is in the category "Antiques\Maritime\Diving Helmets". The seller is "kchicken13" and is located in this country: US. This item can be shipped to United States, Canada.