George Stockwell & Co is correct. The date letter is d for 1919/20. The U is actually the astrological sign for Leo used by the London Assay Office for imported silver.
Your T-bar picture shows only the lion passant and date letter. However the date letter is instantly recognisable as the Chester date letter Z for 1925/26. This implies that B&S must be Britton & Sons, a Birmingham company who seem to have specialised in watch chains and cases.
Coins are not my speciality but reading the rim it appears to be an Italian coin with the head of Victor Emmanuel III who was king of Italy from 1900 until 1946.