If by "logo" you are referring in your attached photo to the painted on green bits, I believe those may just be reference markings added by a previous owner to later aid reassembly. If you are referring to the stamped three characters that resemble "SIE" or perhaps "5IE", those are probably just foundry batch marks. Here are a couple of similarly-stamped examples, the right-hand one of which also shows painted on reference markings, also in green (must have been a popular, or perhaps even more likely
UNpopular, shade of nail polish that wives around the world didn't mind parting with).