You can't judge a movement just like that. Even the indestructible 6497 may come with screwed up errors. Amplitude is acceptable while the beat error needs a lil tweaking, probably balancing the rotation of the wheel.
Hi, it´s got nothing to do with the movement quality itself, it´s got to do with the assembly quality of the movements. If dirt and dust got inside it will not perform. This will vary from batch to batch and specific sample to specific sample.
The beat has to be adjusted and one would need a Timgrapher for that. Oldtimers used to set the beat by ear or by sight, but there's so need for that anymore. Just because that is what the Timegrapher read doesn't mean that is the best the movement can perform. I received one last year that was worse than that but I put it on the Timegrapher and adjusted it to a very good rate.
Some of the kids who take the QC pics have no idea what they're seeing and they just shoot and email.