Lego model numbers

mscheaf · 2014-09-15T16:30:43.000Z

I was wondering about the model numbers for sets. I noticed all the sets are XXXXX-Y, where the Y is a 1 99.99% of the time. I know I have seen a few -2 sets here and there. I can't think of any off the top of my head but I know I have seen them. What is that all about? Is there a method to the madness of these set numbers? Will a set number tell me anything about a set?