Picking the best primary key + numbering system

Question

We are trying to come up with a numbering system for the asset system that we are creating, there has been a few heated discussions on this topic in the office so I decided

Answer 1

I would personally say keep it simple and stay with an autoincremented primary key. If you need something more "Readable" in terms of display in the program, then possibly one of your other ideas, but I think that is just adding unneeded complexity to the primary key field.