My Ball Hamilton grade 999. Earlier than yours, based on the Hamilton 992 movement. This one is in a Ball case, but not the correct original case to this movement. The case is the Ball 21st Century case with the patented stirrup bow which originally would have been fitted to the 23-jewel Hamilton Ball grade 999 movement. This case came to me with a Waltham Vanguard movement in it (strangely). But I had the 21st Century Ball case in my collection with a WALTHAM movement in it. (Equally strange). As soon as I got home, the Ball went into the Ball case, and the Vanguard into the Vanguard case.
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