I’ve owned this 4512 since December 2023, was bought pre-owned but like new. The accuracy has always been awesome and just had it on the timegrapher so wanted to show some love to Serica. Great work, love the manual wind of the 4512. The 7505 is something I have my eye on too. The Amplitude surprises me the most. I’ve seen a lot of Rolex and tudors with better accuracy but the amplitude is often between 240-280.
Crown to right face up
Rate - +4
Amplitude - 321
Beat rate - 0.1
Crown to right face forward
Rate - +4
Amplitude - 295
Beat rate - 0.1
Crown up to ceiling
Rate - 0
Amplitude - 305
Beat rate - 0.2