Ah, well I shan't post a pic of my hammered shillings then.
They are all sorts of odd shapes and sizes making it impossible to choose a tray that is ideal for all of them.
And just when I thought I'd got the best compromise, a friend gave me one on such a large flan I had to enlarge the recess to get it in at all!
However, with milled coinage, you could choose capsules that just fit the tray recesses and then buy spacing rings to hold the smaller coins centrally to the capsule ...