Different 8×11 brass cassettes

I have two of the Jimmy Li 8×11 brass cassettes, and they are absolutely fabulous in using. Sometime they get abused too, but there is no sign on any of them. They will outlive me, for certain.

Brass cassette inside a Minox III

I noticed they are different: same measurements, so we can get this out of the way. The differences are not affecting their functionality by any means.

So to resume, these are the two cassettes: same materials, same dimensions, same design; however, I guess they are from different batches:

No 1 – grind finished

No2 – machine finished

Same situation on all sides, see here:

No 1 box has felt glued on the bottom of the two halfs, whereas no 2 is plain metal. Same dimensions though.