I purchased my gorgeous Marine Original about a month ago now, and have been tracking it's accuracy using the Watch Tracker iphone app. This is an app where you record what time the watch reads at each "datapoint" and the app calculates now much time it has gained or lost over time, charting the results for as long as you want to run a dataset.
For the first 3 weeks of ownership the watch was running a pretty steady +15s/day. The rate it would gain throughout the day and night was fairly consistent. Over the last week I have noticed a change, and the watch now seems to be significantly affected by it's orientation where it didn't seem to have been before.
When resting dial up over night, for example, it will gain about .4s/hour, or a rate of about +10s/day. However, when wearing it during normal desk warrior duties, it's gaining about +1-1.5s/hour or about +20-30s/day. During an average 10 hour work day it will gain about 10 seconds or maybe a little more which is a rate of +24-30s/day.
I also recently did some additional orientational testing and found that resting the watch with the crown facing up makes the watch track almost dead on accurate all night, or less than +1s/day. Resting it crown down, the watch runs at a rate of +20s/day.
This is different than I experience with my other automatic watches (a 2428-2 and a 2894-a2) which have only very small variance between their rate when resting in different positions and being worn. I understand the Unitas movement is a totally different animal that I am just gaining experience with.
Here's a sample timing run over 2 days. Overnight, the watch was rested crown up. During the day, I was doing normal office work and relaxing at home in the evening. The first picture shows the amount that the watch is head of actual time at each data point.
This second picture shows each datapoint and the amount the watch was ahead of actual time at each point.
So I want to bounce this off the collective community here. Are these types of accuracy variations normal, or might there be something wrong with my watch? I'd like to avoid having to send it back to Stowa due to a hypersensitive owner, but if there is something wrong I'd like to get it corrected as well.