It looks like a repair I did with I think a similar product to JB (never used JB) to repair leaky screw bosses in my primary case, and that worked ok once I figured it out.....finish off as above
I had a problem with the interface between the Dynamo drive chamber and oil pump chamber not being wide enough/aligning, they overlapped about half and half, so had one rebuilt.
Under the blue towel/cloth, I can see what looks like a brass/bronze sundial face similar to one I have/had....any chance of a better look? Mine has a short verse on it....