This Simplex UK price from 1957 is a little dull in terms of graphic presentation, but does have its interesting points:
The splendid slogan ‘Simplex ... The gear with guts and glamour’ - give that copywriter a chocolate watch (scan 2).
The claim that there were 10 million Simplex users the world over (scan 2).
The additional claim that, at the time, Simplex produced more derailleurs than all its competitors put together (scan 2).
The prices (scan 4). The Simplex Juy 543 was 69/6, or 3 pounds 9 shillings and six pence equivalent to £3.48. The Bank of England’s handy inflation calculator indicates that this is the equivalent of £68.84 in 2011 - which, given the £400+ price of Shimano’s Dura-Ace Di2 in 2011, seems remarkably reasonable for a pro-quality derailleur. The humble Simplex Tour de France was 22/6, equivalent to £22.35 in 2011 - roughly in line with Shimano Sora.
The illustration of the ‘Get You Home’ device on scan 4.