AVON M50 C50 Series GAS MASK VISION CORRECTION EYEGLASS OPTICAL INSERT 71014/1 | eBay
AVON C50 gas mask
AVON M-50 PROTECTIVE GAS MASK SIZE Medium F Used | eBay
AVON C50 + Overview (in comments) : r/gasmasks
Avon Protection PC50 The New Generation of Protective Mask - Brigham Industries
Avon Protection C50 (APR) Air Purifying Respirator First Responder Kit, includes mask, two filter types, two outserts, and a carrier - Dana Safety Supply