Timegraphing 101. What is it, why do you do it, and how is it applied?
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Think of a timegrapher as an EKG machine, not for your heart in this case, but for a mechanical watch movement. Basically, it reads the ticking of the movement, compares it to a perfect beating movement, and tells you how many seconds per day your tested movement is off from perfect.
There are other pieces of information (i.e. amplitude, beat error, and lift angle) conveyed by way of the timegrapher, but those are of lesser importance than the rate measurement. Essentially, those other parameters can be used to diagnose problems that are causing the rate to be out of whack, if that's the case.
Why do I do this and most, if not all, other watch sellers don't? In a nutshell - confidence. When I was more of a consumer, I purchased watches and it was ALWAYS a hit or miss occasion as to how well the watch conveyed the actual time. Quite frankly, I hated not having ANY idea how well the watch performed before I bought it. This meant the seller was in the position of being to sell me a 'lemon' and I had absolutely no way of knowing. I decided I could do better than this - MUCH better.
As such, each piece you purchase from Primetiming will have the actual performance printout from my timegrapher accompanying it. The rate adjusted will as close to perfection as reasonably possible. Sometimes this is a quick (<15 minutes) procedure. Sometimes it can take longer. Really depends on the movement I'm working with. I know which ones take longer than others, and I know which ones hold their set better than others.
Some things to keep in mind with regard to rate adjusting a movement: there are a multitude of physical disturbances that can negatively affect the rate regulation of a wristwatch - excessive vibration, jolting, dropping, magnetism, etc. When a piece leaves my hands for the buyer, rest assured that the rate result printout that accompanies it is a true and genuine account of the performance I received on my machine. Understandably, what happens during shipping is beyond my control and responsibility. Thank you for understanding.
And to add some addition rate regulation detail, COSC (The Swiss Standard) certification for a chronometer is "only" -4/+6 secs/day for the daily average rate. Keep in mind, only 3% of Swiss manufactured watches achieve this level of performance.