I’ve read where the Hamilton 992B was the most complex and highest quality mass produced consumer product in human history.I have a couple of Hamilton 992b pocket watches (one is ex US Ordnance Department) and both are stunning performers in the timekeeping stakes.
Also both give near identical readings on my timegrapher, despite being made some years apart.
Regards,
Jay.
It took almost a decade to engineer and develop.
Hamilton had time grapher machines, after 1930, but even so Hamilton advertised each 992B after assembly spent over a year being tested and adjusted to six positions, temperature and ischronism. Maybe they sped that up for war production.
The 992B was as modular and had as many interchangeable parts as possible.
And about 1950 the Swiss concern Unitas developed a style of movement referred to as the 6498 (this one is a variant) that had incredible accuracy, durability, ease of service, and undersold Hamilton by something on a factor of four or five times less.
It doesn’t have the nice regulator of a 992B but I was able to get it under a second on the time grapher using a bobby pin.