Rational approach to dating pilotka

[Boudionovka]

hello,
this thread woulld be a collective "rational apporoach" to dating a pilotka, every body are welcome to help us.

First way :

The stamp's style : (I tried to collect picture from all the net).

1980-1989



1970-1979



1960-1969



харьковскии совнархоз фабрика = Factory of Council of Economic of Karkov
головных убороз = manufacturing patent ?
г харьков = City of Karkov
1 сорт размер 55 = sort 1 / syze 55



1950-1959

Post war stamps of the "red warrior" factory, this type is very often faked, by erasing of the date.

1940-1949

Stamps of the "red warrior" factory of the 40's.

to follow

[Boudionovka]

Up date :

to stamps of the red factory.

And one of the karkhov's factory.

see the first message.