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I will get give it a go again
Maybe something a bit more challenging than a quartz chrono this time

https://uploads.tapatalk-cdn.com/20191026/9fb3856d693834f4c21779ee5cd85d4f.jpg
29 seconds!

https://uploads.tapatalk-cdn.com/20191013/bb5b1e281e27cac19d12fee381a156f6.jpg

The Gen 2 is 25 secs fast now.

https://uploads.tapatalk-cdn.com/20190812/cc36cac3a9fee34fe3d81e375efc7f23.jpg

10 seconds fast now.

https://uploads.tapatalk-cdn.com/20190802/0a74b639dac2a264df665f21b13148e5.jpg

Not posted an update for a while
It is now 7 secs fast

Hmmmmmm very strange
The GEN 2 is now almost dead on. It’s approximately 0.5 second slow,
https://uploads.tapatalk-cdn.com/20190701/6bc10d55e8cd61a3e345e007900d2404.jpg
I have not altered the time...

https://uploads.tapatalk-cdn.com/20190603/f0b98ccd4c1ba69f84af551f6aadc366.jpg
+15 secs now.
0.3 secs a day

The Gen 2 has gained 9 seconds since we started
0.2 seconds a day

https://uploads.tapatalk-cdn.com/20190427/7273d17a948a33b436e673a4c2a0abd5.jpg

It has gained 6 seconds since we started
0.2 seconds a day

https://uploads.tapatalk-cdn.com/20190410/7d4ac788832f0a2acd34325dcbc617f3.jpg

The Gen 2 is now 2 secs fast.

The Gen 2 is 0.3 seconds a day fast currently.
Its 1.5 seconds fast over the past 6 days compared to Time IS.

The Gen 2 is 0.2 seconds fast over 2 days according to Twixt.
It’s looking promising...

https://uploads.tapatalk-cdn.com/20190331/e2b046ccd4f19ffbb2d8de8b9467565d.jpg

Well a sub £1000, unserviced, 26 year old, RAF issued Seiko Gen 2 for my entry.
I changed the battery a few months...

I think the OP is a great idea but the above suggestion might make it a bit complex.
I think one watch per person would give a good indication of relative accuracy over 6 months for a variety of...