English hallmark to identify please

Hello
Could you please advise me what part of UK is this hallmark and a period of time please
Thanks



It is a London hallmark. The date letter may be “c” for 2002 (or possibly “d”? for 2003). Note that it also includes a “Convention” mark allowing the piece to be sold in signatory countries. The sponsor, SJL, is not known to me.

Phil

Thanks a million for your help