it's from old VAZ car (USSR)
VAZ 2108, 2109, 21099 models, engines 1.1, 1.3, 1.5 l.
also it was on early models of 2110 and 2111 cars with same carb. engines.
price in Russia about $15
in Ukraine price almost the same, but now i move from Ukraine to Russia becouse of war.
found video, that shows how this thermostate working.
on video operator warm-up thermal element by hand, and door slowly moving from "cold intake" position to "warm intake" position.
veeeeery slowly, becouse temperature of hand (36.6C) just slightly higher than "switching" temperature of thermaostate (about 35C).
if temperature will be higher (for exapmle, put element to hot water) door will switch much faster.
and if element put to cold it will move door back to "warm intake" position.