Miker As cases go, those are some of the best I've seen. They look to have had little use, and none of the usual problems are evident. More common are broken and split chaincase cover threads, cracks and bruises and evidence of the clutch chainwheel wobbling to allow the chain to contact the case. Slack chain also machines away parts of the case.
So looks a good set and bodes well for the rest of the engine parts, you've struck lucky.
Swarfy.