Our last clue card is related to our first clue card, but a better way of looking at it, because this is a very good way to keep your weight within the size for your height. Also it must be said that this set is great, for a lot of the manoeuvres can be performed without special equipment, and also, just like here, whilst seated.
Now I cheated a bit here and started my hunt by looking up the original version, which you may have first believed this was, issued by Lambert and Butler. That was issued in 1937, two years earlier, and we featured it in our newsletter of the 17th of September 2022
However the entry for that did what I hoped and gave me the RB.21 code, of RB.21/209-63.B, so it was very simple to find.
That was not very expansive, only reading :
KEEP FIT
A. Anonymous issue, with letterpress on back
B. Lambert & Butler home issue.
.... but of course I now realise that most of the gen about it would have been in the original Lambert & Butler reference book. And that is now inserted into the newsletter to which we link.