Super ! Michael........
Not seen any of this material before,
the advantage of living in the country, no doubt.
Thanks for sharing with us.
I see your point about the #857...feeling less confident.
Quote:
2 blocks that hopefully a printing expert could use to understand something more about the printing method?
The 20 paras with what the British call the "Jubilee Line"
I wonder if they were the preserve of letterpress only?
(To strengthen the printing plate / forme)
I don't recall seeing them on Lithographs before.
I also wonder, how the stamp impressions, travelled between the three printing houses..

Not seen that discussed prior.