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Does it have the screw clamp or band clamp on the bottom ? The screw clamp is older that would be 60's. I might have a few of there catalogs also. I will check. I have hundreds of vintage masks. Most of them in the original boxes.
Sorry too for my own late reply; I thought SB was undergoing maintenance.
I see the mask was made by Kinugawa, which means it was made in Japan. If I recall correctly, Kinugawa Rubber is the parent company of Gull Marine Sports, which manufactures basic diving gear in Japan; see, for example, Products | GULL Scuba Diving.