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A mystery wheel.....
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Not too much of a mystery. JAP stants for J A Pearce Engineering from Southall, Middlesex, who had a couple of F1 entries in the mid-1960s. The Magna wheel was designed to withstand harder knocks than your average magnesium wheel, and many seem to have survived without the usual magnesium rash. They made them splined for Jags, MGs etc, as well as bolt on. They are very sought after by Mini Cooper owners, though I doubt whether the 16" x 10" would fit... /ubbthreads/images/graemlins/grin.gif
Hope this helps.
Rob