Postal Mechanization in the USSR
(cont)
Envelopes with three start bars were produced to standard specification GOST 34-73 and were issued only for a short time in 1973, mainly on non-pictorial covers. These start bars are known officially as Ksh-2.
Example One. Front of envelope
Example One. Back of envelope
Example One. Back flap with instructions
Example Two. Front of envelope
Example Two. Back of envelope
Example One. Back flap with instructions