Quarantine Coloring Book
The Chinese TF-1 was a copy of the Soviet ShM-41M, but used a gray plastic assembly and had larger eyepieces. It was used for industrial purposes. This example was made by Nonkinko.
Similar masks in my collection: NVA/Soviet ShM-41M, Bulgarian ShM-41u, Russian ShM-62u, Polish ML, Polish MUA, Polish OM-14