The Pulmosan 1750 Junior Gas Mask was made of light gray rubber with two large round eyepieces.  It had a button exhale valve on the left cheek, and a large threaded port to accommodate the filter.  Equipped with Type JCC Canister for Organic Vapors and Acid Gases.  Made by Pulmosan Safety Equipment Corp.

Similar masks in my collection:  Pulmosan AL 170, LECCO No. 45