Well, as most of us know, buying a used bike can have it's pitfalls, but it's always nice to see a bike with a nice fully stamped up service history It helps with residuals when you sell on, but again, this is not real proof that the bike has been serviced properly.
I had just an experience a few weeks back with this. My dear wife who suffers with MS loves being a pillion, but she's gradually deteriorating. Her purple Bonnie is a great bike for her and I take her out on it as often as I can, but more than a 100 mile round trip she suffers greatly with pain so we're trying out other bikes that will increase her comfort as well as increased mileage.
I've sat her on a multitude of touring bikes and the Yammy FJR seems to be the favourite contender. The used market is awash with them and I've ridden a few from dealers and private sellers. Not a decent one among them as yet. Most have been abused. Many examples with front fork seals leaking, saggy rear shocks, cracked fairing bits, rattly cam chains, badly scored top yolks where prison officers keyrings once flapped about in the wind, and the big major services just around the corner. Anyway, I digress. The latest bike I viewed looked the business but the owner was a little bit cagey regarding the service history. When I pressed him further on the matter he admitted that he did all his servicing himself but got his mate from a Yammy dealership to fully stamp up the bike's service book.
So there we have it. I'm willing to spend good hard cash on a good used example, but they're as rare as hens teeth. The stamped service book is a thinly veiled attempt at duping the unwary. So beware.