Aurora watch company made pocket watches for short time and later was purchased by Columbus watch company and was renamed to Hamilton.
They are not considered high end but 19th century American key wind watches just have something to make me sweat :D
Model 1 movement from around 1885.
Total weight with case some whopping 190 g / 0.42 lbs
What got my eye was the key attached near the T-bar because it is of a wrong size for the movement.
But after some time I got a strike to understand how is that used! :D
Step 1. We have a T-bar and a key on their personal sub-chains.
Step 2. We push the T-bar through the key loop.
Step 3. When done all the way though -> we a perfect secure loop.