With so many variables in markings plus an unknown, there is too little to go on just to speculate.
Can you raise the first one?
Numeral or digit?
Gaps between letters/numbers?
Punctuation marks such as periods/fullstops etc?
Without all, there is no way to tell really.
Is it a town or county abbreviation with a unit?
Regimental number?
For example:
*TS could be a location as might 3T or 3TS.
S. M could represent a militia.
?T S.M. could be Sappers & Miners.
Not saying any of this applies. Only pointing out the difficulties in making a guess.
Then there is country of origin within the Commonwealth and Empire.
Perhaps School of Musketry!
Personally, I need more to work with. Even then I couldn’t guarantee a positive result. Not with the listings at my disposal.