How accurate is your ST-19?

[JohnF]

Hi -

Thanks! You're the first one to report. Much better performance than what I have reported, makes me wonder if I am doing something wrong (which most certainly cannot be ruled out...). Will have to run my tests once again...

JohnF

[gigfy]

Testing in progress.

gigfy

[particleman]

I'll have to wait to the weekend to test on my wrist. I'm a painter so I can't wear them to work

Seagull Chronograph, Model 0433(from cnmark)
1) will test on wrist on 9-28-07
2) face up: +08s/day
3) face down: +10s/day
4) crown down: 0s/day

Auguste Galan, SS Skeleton Chrono(from Heritagewatchcompany)
1) will test on wrist on 9-29-07
2) face up: +04s/day
3) face down: +14s/day
4) crown down: +10s/day

[cnmark]

I wear 5 watches with the ST1901 quite regularly, checked accuracy so far only when worn, these are the last values I jotted down for them:

Ray's Heuer remake: +20
Seagull 1963: +08
Seagull 0437: +10
Seagull 0433: +02
Seagull 0446: +06

As soon as I have time I will do the face down / face up / crown down tests.

[sphinx88]

Wow, seems like except John's watch, anyone else is pretty accurate.

It is surprise to me that same movement gives different accuracy and most important and obviously, Sea-gulll knows very well how to adjust their own movement better than others.

Is there a secret trick which sea-gulll did not release to third party about how to adjust their movements?

[gigfy]

OK, you are not going to believe this. I didn't.

Auguste Galan Chronograph, (Seagull ST1901 mov't) (from WWOA)
1) +0s/day 24-hour wear
2) face up: +0s/day
3) face down: +0s/day
4) crown down: -1s/day

When I first "synched" my watch with Time.gov at 10:15:55 yesterday morning, my watch read 10:15:10. OK, so -45s behind. I couldn't believe it when I started checking it throughout the day and when my watch would roll up to 10s past the minute, I'd look up and Time.gov would be at 55s past the minute. Every time. Even when I checked it this morning.

The only time I lost/gained time was with the crown down. I understand that 1 second deviation during the 1hr test is 24 s/day (+/- up to 24s). Very crude, but an easily attained measurement.

What blows me away is the +0s/day!

Cheers,
gigfy

[siyexcalibur]

I think it is just tedious to adjust the accuracy you need to monitor it in different positions, needs lots of time and effort. Also if John uses 1 hour to judge, it is prone to errors. If you miss read the start time by +one sec and the end time by - one sec the error of 2 seconds will itself will be multipled by 24 and become 48 seconds. Anyway John's watches are seagulls, and a lot of his readings are obtained not through wearing but testing by placing in static positions after manual winding. If you wear your watch, you will get better accuracy as the positional errors cancel each other.

[lysanderxiii]

I think it is just tedious to adjust the accuracy you need to monitor it in different positions, needs lots of time and effort. Also if John uses 1 hour to judge, it is prone to errors. If you miss read the start time by +one sec and the end time by - one sec the error of 2 seconds will itself will be multipled by 24 and become 48 seconds. Anyway John's watches are seagulls, and a lot of his readings are obtained not through wearing but testing by placing in static positions after manual winding. If you wear your watch, you will get better accuracy as the positional errors cancel each other.

The quality of a movement can be determined (roughly) by the magnitude of the positional error. For example, if the poise is way off, the horizontal positional times (dial up, dial down) will be affected less than the vertical position timings. Similarly, if there is a bad spot on one of the balance jewels (a crack or chip) you will notice a positional variation.

John,

I might suggest that if you run the positional tests again, use the stopwatch function to measure the time displacement. (ie start the chrono at master clock reading: XX:YY:00 time, place in test position, wait an hour or two, then stop the chrono at master clock reading: X+1:YY:00 time.) This will tend to cancel out you reaction time (since it will be almost the same at the beginning as at the end.) And with the larger second hand frozen in place it will be easier measure the difference.

[JohnF]

Hi -

I am planning on retesting my two watches with the ST19 and will post on that, but right now reality is intruding...

JohnF

[particleman]

Seagull Chronograph, Model 0433(from cnmark)
1) 24h on wrist -07s/day
2) face up: +08s/day
3) face down: +10s/day
4) crown down: 0s/day

Auguste Galan, SS Skeleton Chrono(from Heritagewatchcompany)
1) 24h on wrist +06s/day
2) face up: +04s/day
3) face down: +14s/day
4) crown down: +10s/day