I am coming up to a big birthday for my husband. He's narrowed which watch he would like to 2 selections: 1. The Breitling Premier B01 Chronograph 42 (£7,025), or 2. The Breitling Premier Chronograph 42 (£5,250) I understand the primary difference between the two to be that all of the parts in the B01 are made in house by Breitling, but I have no idea if that's important or worth the additional cost if you aren't a collector? Any advise gratefully received.