I hope this thread is acceptable to the site.
My friend has died and I am selling his effects. I came across this Starrett gauge. It is, I think, an internal bore micrometer 2" – 4". It feels old…the case is well worn but the components are in good condition. I think the spanners are not original.

I don't know who would use it, what it is worth and where I could sell it. So I am asking the advice of the experts on this forum.
If you can help I would appreciate it.
Thanks
Ray