Are These Correctly Called Cinderellas?

Opinion.
Great Britain : Ephemera

Should the congress stamp, been printed from the original die,
then a "black print" reproduction.

https://en.wikipedia.org/wiki/Posta...C2%A31_stamp

Thanks for the quick response.
Considering the lack of fine line detail on the item, I strongly think it's not a "black print" reproduction.

Indeed,
a black print, would show only the stamp and not the black border, nor perforation teeth. And the paper would show indentation from the die pressure. (Intaglio)

Still interesting, I would mount these on separate pages in my albums,
amongst stamps of these series.

These look like pages from a book, possibly an auction catalog. Is there anything on the back?

Nope, they're just on those pieces of card stock.
Around that time (1929) there were many philatelic exhibitions in the UK and I suspect these were souvenir handouts.

Agree
The £5 could also be a "dummy stamp"
albeit, not seen before with black border.

Having produced the handbook on British Stamp Exhibitions with Graham Wilson, I can confirm that there is nothing to indicate that these have any connection with a specific, or indeed any, British stamp exhibition. They could, of course, have been handed out as suggested, though, but unofficially.

If you would like to download a free copy of the three-part 1,262 page PDF catalogue mentioned, then go to
https://www.gbps.org.uk/information...ies-misc.php

GLENN H MORGAN

I greatly appreciate your generous offer to allow me to download your handbook for free.
I do have a few items definitely labeled with their association to some British Stamp Exhibitions, most probably more common ones.
There was a time I when I was collecting cinderellas produced not only in association with British Stamp Exhibitions, but also GB&BC in general, and more than just exhibitions.
They were a side interest to the postage stamps issued during the reign of KGVI that I was collecting.
I got reasonably close to complete (probably at the 90-95% level).
Most of what I was missing were the WWII Japanese occupation overprints.
I even had one of the Andaman & Nicobar occupation overprints.
But all that material was sold when I changed direction in my collecting interests.