Apollo 8 running 8 seconds fast per minute

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Earlier in this thread, you indicated that the watch had not been “bumped”, or dropped. This sort of problem is always the result of a shock of some sort. Your are not out of the woods yet. Now that you have had the case back off, what measures will you undertake to be certain is properly sealed?
OP never took the back off, just gave it a good shake. At least that is what I understand.
Edited:
 
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OP never took the back off, just gave it a good shake. At least that is what I understand.

Either the OP has X-Ray vision, or the watch has a glass back.
 
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Either the OP has X-Ray vision, or the watch has a glass back.
Apollo 8, sapphire back. No x-ray vision required.
 
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Managed to resolve it. Used my loupe and noticed that the hairspring looked tangled and wasn’t ticking like normal.

Gave it a hard shake thinking it had to go in for a service anyway so what’d I have to lose. Gained 1 second today while sitting dial up after a full wind. Hairspring is ticking normal again.

Some Seikos are well known for this problem, and the standard "fix" on forums is to smack the watch dial down into the palm of your hand. Demagnetizing can sometimes cause the spring to untangle also, which is one reason I suggested it.

I'm sure my SM300 Watchco with a vintage movement gets more of a hard shake while I play 6+ hours of tennis each week with it on than you did here - watches aren't babies, so no need to treat them like they are.

Cheers, Al
 
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I can confirm that my Apollo 8 watch ran fast, until I demagnetized it, and then it ran absolutely perfectly. I used a simple demagnetizer bought on Amazon [https://www.amazon.com/dp/B07H9YC4DJ]. To use, simply thread the straps together face-to-face abouve the watch face so that you can pluck the watch off the unit with one hand while still holding down the red activation button on the unit. "Treat" the watch for tens seconds and then slowly lift the watch off the unit with one hand (while still running it (red button) with the other hand) until the watch is far away (a couple of feet). then release the red button. Your watch should now be demagnetized, and run accurately.