Blue factory mark enclosing the date letters oo for 1791, adjacent painter’s mark Bo for Henry-Germain Boileau fils (active at Sèvres 1781-93) and gilder’s mark FM for François Mirey (active at Sèvres 1787-92).  Incised mark 24

From a service ‘Zone bleu, Guirlande de feuilles de Chêne‘.