The Bryan's Elevenses is one of the most popular Allwin machines. It may not look like much, but it is surprisingly fun to play. It operates on UK pre-decimal pennies and has multiple mechanically programmable payouts. It includes an ingenious mechanism that alters the spring tension for the ball launcher on a win, so that you can't memorize a winning drawback position. Here are some before and after pictures of my restoration:
Before (it came without a cabinet, so I had to make one):
After. Sitting proudly on the wall of my game room (I left the coin overflow door off for ease of play). I made one change to the original design, which was to not paint over the screws that hold the corner brackets in place. Apologies to any purists out there, but I just like the look with the brass screws showing: