Quoted from DirtFlipper:The Williams games (Klondike/Yukon/Gold Rush) are the only ones I can think of which have a true 'vertical' reel on the playfield. And of course none of those match the year or theme.
Surely there must be more games that had a vertical reel on the field?
The only ones I can think of off-hand that had a single playfield reel like that are Jungle and Friendship 7. Neither with a circus theme or multi-player.