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The cold temperatures mentioned are an interesting point. I would think a digital display would have more problems at -20C than a mechanical.
The new ones are solar, and have automatic time synchronization via RF signal (if there are any in Canada)…
This is true. The low-temp LCD displays are limited to about -20˚C, and start to fade. Many mechanical watches also recommend -20˚C as a lower limit, but I've routinely worn many mechanical watches down to ambient temperatures of -30˚C, and nothing bad has ever happened. Unfortunately, that is a typical December morning temperature in Crested Butte, where we spend a lot of time in the winter. Of course, the actual temperature of the watch on my wrist is probably warmer than ambient.
I'd definitely go with Sinn 😉
I had many of them and right now I am left with only one, which is my favorite of their catalogue the EZM 13.1
Here is a photo of it :
Sinn watches are engineered to be used in tough condition. For instance, this model is tested from –45 °C to +80°C ; and also tested to magnetism.
Another model tested to very low temperature is the ARKTIS II, here is a stock photo :
That would be my recommendation for you since you opted for the seamaster 300 - which is a "dressy" tool watch with high polish.