This set is listed in our original Gallaher reference book (RB.4 - published in 1944) as :
1924. 100. TRICKS & PUZZLES SERIES (titled series). Size 2 1/2" x 1 1/2". Numbered 1-100. Fronts lithographed in full colours, marginal lines and white margins. "Gallaher`s Cigarettes" incorporated in each picture. Backs printed in green with "Solution" and "Issued by Gallaher Ltd., Belfast & London." Probably printed by E. S. & A. Robinson Ltd., Bristol.
This is shortened in our World Tobacco Issues Indexes to just "TRICKS & PUZZLES SERIES. Sm. Back in green. Nd. (100)
Now let us say straight off that there is a bit of a question over the date. Our RB.4 clearly says 1924, but in the 1950 London Cigarette Card Catalogue it says 1913.
To make it more confusing there is another Gallaher set by this exact same name, but luckily it has a black back, which is rather plainer. And you can see that at in our newsletter of the 15th of October, 2022 - it`s first up, as the diary date card for Saturday the 15th of October. https://csgb.co.uk/publications/newsletter/2022-10-15