Oh dear,I thought I’d sent a message which is flying about the ether,so here we go again.I haven’t got aUV light,so will have to beg or borrow one to find out if my little pearls glow red or orange.Pearlescence,looking through my loupe the letter looks more like a lower case h,and the dates that match for English marks are1863,which you said is too early,then1903,possible?) and 1923,which looks a too angular font.I candled a few pearls from each strand,and there isn’t a clear demarcation line between the bead and the nacre,which seems to point to the fact they could be early cultured pearls who had a lovely long life in their oyster before landing in this necklace!the image I hope I have downloaded I took in artificial light,all the other images on this thread were taken in natural light.This is the first time I’ve ever taken phots on my I pad,so delighted that cam through!