This workshop used a very specific form for its breast stars.
All known breast stars have St. Petersburg silver assay marks from pre-1899 time period.
Breast stars usually bear workshop mark МБ /MB/ supposedly мастерская М.И.Богданова/M.I. Bogdanov workshop.
Breast star without МБ /MB/ mark...
imperial china awards and decorations
imperial china double dragon order
m.i. bogdanov workshop
markmb
order of double dragon
russian-made order of double dragon
клеймо мб
мастерская м.и.богданова
орден производства мастерской богданова
орден с клеймом мб