On this day (10 April) in 1937 a game viewed as being the title decider saw City defeat championship rivals Arsenal 2-0. The game, played in front of a Maine Road crowd of 74,918 (still not the highest for a City-Arsenal fixture at Maine Road) swung the advantage to City and ultimately the title came to Manchester. One point on the attendance… Back then City used to announce the crowd as being number of tickets specifically sold for that game, plus those that paid on the day, i.e. the figures did NOT include any season ticket holder. As the Blues had a couple of thousand season ticket holders then the attendance is known to have been at least 76,000, but an accurate figure does not exist (only those we know turned up and paid on the day or bought a ticket specifically for that game).
You can read more about the game here:
Gary James' Football Archive 