I think your probably right; that it's a civilian club ring of some kind with a generic design. There are some initials that are nicely engraved inside the band and some numbers, possibly a date; cant quite make it out as the ring was in a damaged state when I retrieved it.
Or maybe it's like Lennon's number 9 dream; it's not meant to be understood.
"Eis" the only word I can make out and according to a Latin dictionary:
"Eis" is a form of the Latin personal and demonstrative pronoun.
The nominative forms are:
Is, Ea, Id (He, She, It)
and the Plural are:
Ei (Ii*), Eae, Ea (They (men), They (women), They (Things))
(*Ii is sometimes used instead of Ei in the plural masculine.)
"Eis" is either plural Dative, or Plural Ablative, and hence can mean many things:
By Them.
From Them.
With Them.
To Them.
or
From Them.
This particular form can mean many things since it is the same in every gender and it is used in multiple cases. Proper translation relies on surrounding context.