Time Of Flight Indicator
G'day Mike,
I have a brass disc that states it is a Time Of Flight Indicator for Full and 2/3 Charge loads for a 6 inch BL, but it states for a MkX1, rather than Mk7 as you have asked for.
Is this is helpful for your research I can dig it out and get some good images of it to you. I think it is double-sided as well...
See pic to get an idea of what I mean.
Jared
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