Official original name of this badge "Почётный жетон "Добролёта"/"Dobrolyot" Honorary Jetton (Watch Fob)" see https://asiamedals.info/threads/dip...-vozdushnogo-flota-akcioneru-dobroleta.24600/
Badge was designed by famous Russian avant-garde artist Alexander Rodchenko https://en.wikipedia.org/wiki/Alexander_Rodchenko
Currently three manufacturers of these badges are known
TM /Tremass/ (Badges No.18-217 and Badges No.6497-7573);
PV /Pavel Vinogradov, head of the metal jewelry workshops of the Academy of Arts/ (Badges No.187, No. 225-2299);
LG ONO /Leningrad provincial department of public education workshop/ (Badges No. 3384-5957).
Badges made by PV /ПВ/ workshop.
Maker's mark PV /ПВ/ belonged to Pavel Dmitrievich Vinogradov /Павел Дмитриевич Виноградов/ who was the head of the metal jewelry workshops of the Academy of Arts /металлические ювелирные мастерские Академии Художеств/.
No. 187 (black fuselage variation)
Silver, gilding, enamel.
Marked with "PV/ПВ" mark, Leningrad district assay office mark (alpha, female head in a kokoshnik to the right, 84) + round mark.
Size 36.2 × 35.9 mm.
Weight 13.19 g.
Badge was designed by famous Russian avant-garde artist Alexander Rodchenko https://en.wikipedia.org/wiki/Alexander_Rodchenko
Currently three manufacturers of these badges are known
TM /Tremass/ (Badges No.18-217 and Badges No.6497-7573);
PV /Pavel Vinogradov, head of the metal jewelry workshops of the Academy of Arts/ (Badges No.187, No. 225-2299);
LG ONO /Leningrad provincial department of public education workshop/ (Badges No. 3384-5957).
Badges made by PV /ПВ/ workshop.
Maker's mark PV /ПВ/ belonged to Pavel Dmitrievich Vinogradov /Павел Дмитриевич Виноградов/ who was the head of the metal jewelry workshops of the Academy of Arts /металлические ювелирные мастерские Академии Художеств/.
No. 187 (black fuselage variation)
Silver, gilding, enamel.
Marked with "PV/ПВ" mark, Leningrad district assay office mark (alpha, female head in a kokoshnik to the right, 84) + round mark.
Size 36.2 × 35.9 mm.
Weight 13.19 g.