Definitely a 1955 A7/A10 frame with a # higher than 7001, the hole through the frame tube for the brake pedal pivot, the stop for the brake arm next to it, and the brake light switch mounting plate.
The steering lock could have been cut off, the tank mounting bracket definitely has been shortened.
But could of course also be 1954, CA7.1153, and the 2 has been added. That would explain why the steering lock plate is missing, because that had been introduced in 1955 afaik.