I hadn't really paid any attention to that marking, yes, it's 57 1/2.
Seems trange for a genuine or a fake / repro.
Looking at the cap itself it see to have some age and be a little fragile.
A check of my notes about this cap has shown that they were casualties of my desk top and external harddrive joint suicide pact crash and burn of some years ago, all that's left re. this cap are a few images.
I may have some printed notes.......
Last edited by leigh kitchen; 08-03-19 at 04:18 PM.
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