It's no secret to those who read this site that I love the world of novelties and jokes. It's easy to overlook that many of our most successful magic shops and manufacturers were propped up by selling and making these more frivolous things. Many pocket money pranks were imported from Germany, Japan, Hong Kong and China but there were British manufacturers too. Some are fairly well known, such as Ellisdons, BeePee and Brownings, and some barely recorded. I recently fell down a rabbit hole trying to identify the manufacturer of this charming compendium of practical jokes.
On the face of it there seem to be plenty of clues to the manufacturer of this set. There are two trade names used throughout the packaging: "D. H. V. and Co." and "N. U.". Thanks to the wonderful Davenport Collection website the pieces began to fall together. In their collection, they have two joke greeting cards, one with the "N. U." branding, and one very similar branded "Klawvana". Here's a similar card from the set above.
The Klawvana branded card has an unusual logo of a woman and a greyhound, the same as on this exploding compact trick.
The compact is not branded Klawvana though, it is an "N. U. British Product". This suggests N. U. and Klawvana were one and the same, explaining the similarities between the two joke greetings cards in the Davenport Collection. As luck would have it, I remembered seeing the word Klawvana on a novelty recently, a trick butterfly that would fly out of a closed book.
This novelty was a huge success for the U. S. firm S. S. Adams, who patented their version in 1932. As a side note, the patent number printed on Adams' butterflies was always the incorrect "1858538" rather than the actual patent number: 1858535. Looking at British Klawvana butterflies, the early models are listed as patent-pending and the later have a number corresponding to this patent first applied for in 1962. The applicant for this patent was Jack Klaw, who by the time of this application had been manufacturing and selling wholesale into the joke and magic community for at least twenty-two years.
Searching for Jack Klaw in the magic press brings up no leads, but he does appear in an issue of The London Gazette from February 1940.