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If you want to bring a touch of systematics into your measurements then you need to do a full winding of the caliber and measure rates and amplitudes in 5 positions. This gives you a reference data set for this new watch. If you are a Pro then you would repeat this whole process 24 hours later.
After, or better before, you could concentrate on taking some good photos of your setup, maybe switching lights on would help and focussing your camera may help a bit too.
It’s important to see what the setup is, the settings, and obviously the results. Not clear how you concluded that the watch you tested is within specs.
You could also write the results on a piece of paper and keep it for a later comparison. Good luck!
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