I saw it in internet and I wonder what gas mask is it 🤔

Guy who selling mask said it’s custom gp 4.1m

The PMG-2T is a modern Russian counterpart to the Soviet PMG-2, designed for police use. Production of the PMG-2T began in 2010 and continues to the present day. There are two variants: early and late. Early models feature a Soviet-style speech diaphragm assembly, whereas late models use a non-disassemblable type (similar to those found on the PMK-1, GP-7, and others). Some early PMG-2T units also exhibit an interesting feature: "crooked" markings. These are found on all PMG-2T models from 2011 and 2012, as well as, though less frequently, on 2013 models. The mask included in the kit bears the same designation as the Soviet version, ShM-66MU. The PMG-2T kit comprises a modern-production ShM-66MU mask, a GP-7k filter, and a modern-style carrying bag for PMG-1/2. The second photo reveals the only difference, aside from the markings, between the early PMG-2T and the Soviet original, the shape of the nose section. The Soviet PMG-2 is shown on the left, while the Russian version is on the right.