Ok as promised,I suspect it is a late Mk1,as it has been riveted,
and not engraved….Why have they highlighted 300 psi?
The MK1 pilots notes do not mention the pressure gauge capacity.

Thanks for asking after the Demon panel,its coming along,and happily
I have found a very kind person who has a new build panel to spec,
and the deal is nearly done!
But if anyone has details of the various data plates on a Demon panel….
I love to hear from you.
Kind Regards Mike