Yes. Here is the breakdown:
In 1959, they made 1118 BN4, 329 BN6, 1691 BN7, and 4762 BT7. At 7900 total, 1959 was the biggest year for big Healeys!
Looks like your car was built in July, 1959 based upon the listing of production changes in the book, which has this entry: "From BT7/2194 and BN7/2276, cars for North America now fitted with sealed beam headlamps at the factory, July 1959." So, the car that was 10 numbers before yours got these new headlamps. I think the difficulty in identifying numbers on these cars is that the various models were mixed into the same series of numbers. That is, the chart I provided earlier simply says that the first BN7 in 1959 had car number 186, and the last had number 6686, but there are BT7s in there as well, and lots of them. There were 1691 BN7s made in 1959.