This locket (click on thumbnail for enlarged view) measures about 15 mm in diameter. It appears to contain a slice of cable, perhaps a telegraph cable for on the reverse of the locket are engraved the words 'Red Sea Telh' (with a superscript 'h'). It was given to me by my grandmother. I believe she had been given it by an ex-boyfriend. Can anyone shed any light on what it might be?