Dumbledore's broken Nose

At the beginning of the Philosopher's Stone, the description of Dumbledore as follows:

He was tall, thin and very old, judging by the silver of his hair and beard, which were both long enough to tuck into his belt. He was wearing long robes, a purple cloak which swept the ground and high-heeled, buckled boots. His blue eyes were light, bright and sparkling behind half-moon spectacles and his nose was very long and crooked, as though it had been broken at least twice.

We know that Dumbledore had his nose broken at the funeral by Aberforth but is there another time his nose was broken or was this just a severe break to make it look like it had been broken 'at least twice'?

Cannon answers preferred :-)