help identify age of glass and engraving

Hi, guys anyone good at aging glasses? These small ogee bowl small glass have folded feet on three and appear to have on the others but they look more like firing glass feet!? on each glass is the same etched initials but I am struggling to make thm out, I think the last letter might be M? They measure just under 4" so not sure if they are gin glasses or not? Amazing to find 6 together and with no chips or cracks!

Late 19thC would be my guess and probably a wedding gift.

Had these confirmed as c1810 small barrell shaped rummers/wine glasses. Nice little find sets are definitely a rarer find. Will make very nice port glasses for the modern home I think! 😀😀😀