After the last tuning on September 27, the watch started to drift faster than before. I tuned again after only 2 weeks, on October 11. It ws 0.5 sec late; the error went from -6.85 to to -7.25 PPM.

In the 2 months since then, the clock has grown late again, but only by less than a second. Not tuning yet.

Battery measurements show a steady, slow slide:

2023-10-25: 2.988 V
2023-11-08: 2.984 V
2023-12-13: 2.970 V