If you’re a collector of Omega moonwatches, this reference and identification guide is a must-have. Not only is it significantly less expensive than the dead-tree version (over $200), while still covering all of the major areas, it’s portable (the dead-tree version is large and weighs over 7 pounds). Diehard collectors will still want to buy the dead-tree version (there’s something intangible about being able to flip through paper pages without needing power), but this is a must-have due to its portability.

Keeps crashing. Quite frustrating

All I can say is WOW. Very cool book. The guide to identify your watch is a lot of fun. I would love to see a book like this for more watches.