I have a couple of Breitlings, two IWCs, a couple of inferior beaters and I would not claim it to be a collection, just an assortment. I have seen on these pages the excellent handlebar shot of all the Laureus watches (definitely a collection), an excellent post where one of our number has an example of every different type of movement/display (another collection) so where does one merge into the other.
I would be interested to hear your views. Is there an answer?