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If it's a Birmingham hallmark (an Anchor) there is a complete list at http://www.theassayoffice.co.uk/date_letters.html
AT
t for tempo
The letter tav (ת), the last letter of the Hebrew alphabet, has a "t" sound.
Tender is the opposite of mean.
The word "atom" is not an acronym. The letter 't' in the word does not mean anything in particular.
t for tempo
If the letters TH are at the beginning of the 'Hallmark Stamp' it would be the initials of the manufacturer. If the T is separate at the end it could signify the year of manufacture (if English gold it would be 1968). Check on-line for Gold Hallmark Identification, but you will need to give all of the numbers, letters and symbols as they all have a meaning.
Trinidad and Tobago are sometimes abbreviated T T. In sports, TT can mean table tennis.
George T. Morgan is famous for designing and engraving the Morgan Silver Dollars (1878-1904 & 1921), which are named after him.
Trustworthy is a meaningful word. It begins with the letter t.
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