Greetings -- Recognize this mark on the sterling clasp of a pearl necklace?

[rockystradingpost]

Greetings  -- Can anyone identify this writing on the clasp of a pearl necklace? 
I believe it's vintage, and the opposite side is stamped "S 925."

Many thanks in advance.

[treasurechest805 · Accepted solution]

Hi-

It's means "FU" or good luck, good fortune, etc.

[rockystradingpost]

Thank you so much!