Thanks very much for your very fast response, as always.
First, yes, unfortunately it is repaired.
Secondly, as regards the marks, I've attached much better images for examination. The first of these shows the circular mark you couldn't figure out and looks like a partial primitive horse. The third of the images shows another, perhaps partial Amsterdam mark, that I hadn't shown before. Also in direct response to your question, there is an assay scrape which is shown in that same image. Look to the right of the mark at approxiumately the same level, close to the edge of the picture. It's more obvious in real life than in the picture.
Hopefully, that gives you all the info you need!