initial

Hello everybody!!! I found this ring a few yrs.ago approx.8in. down...What i can not figure out is the INITIALS(?) on this ring.It is marked A900(ARGENT=SILVER)W/a flower hallmark.ANY HELP with what this may read will be greatly appreciated.Looks like an M W/a 3 inbetween...HELP!!! THANKS ALL,HH!!!