Muggins
Player Valuation: £60m

Gilbert U-238 Atomic Energy Lab
When? 1951-1952
What? The ultimate educational set to teach kids how to get the most out of, erm, uranium.
It did what?!? This $50 (about £440 in today's money) science kit featured four lots of uranium ore for your beloved sprog to dabble with. To ensure that these weren't duds, you could use the Geiger counter included to measure the ore's radioactivity and order more uranium using a coupon. And to round out the experience, a book entitled 'Prospecting for Uranium' was included, with details of a US government initiative that paid $10,000 (equivalent to almost £90,000 today) if little Jimmy discovered any uranium deposits in the garden.
Best seller at North Korean car boot sales...