I’m looking at a supposed 1915 Lithgowicon with hooked quillon but the date of 1915 as well as the shield & Lithgow all stamped upside down from what I’m generally seeing elsewhere. Is this a red flag as it seems to me or is not of concern to those in the know? It also has a stamp of 10/21 which I’m unsure what that indicates. I’m a decades long collector of American stuff that’s now learning on Britishicon & Commonwealth & Imperial nations’ militaria. Thank ya.