Not sure who did this check, but they have used a program for a Rolex 3135, which has a lift angle of 52 degrees. The 1861 movement has a lift angle of 50 degrees, which means the balance amplitudes shown, which are already a bit low as they appear, are actually lower than what is shown.
The chances that this movement requires a service are high, so I would account for that in the price you are willing to pay.
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