AJS is almost certainly Arthur Johnson Smith a “manufacturing jeweller” of Variety Works, Frederick Street, Birmingham. It would be useful to see a picture in order to be certain, but there seem to be issues with picture uploading on this site at present.
Markings are so small having probs getting them to show up. No matter - I am sure the A.J.S is for Arthur Johnson Smith. I can’t find any info about him on internet. I was trying to find out its value although I don’t expect it is worth alot when I can’t find any info on A.J.S.
I have another two items to ask about sometime. Might be easier if I use my sons digi camera to take photos of them. Bit pointless asking for help if I haven’t got knack of putting photos on site yet.