It is a huge thread in the watchmaking section. I have 7 or 8 what I thought were Landeron 48s. Turns out some are landeron 50s, or 70s. Thought they were 51s but there are so many variations. The difference between 13.75 ligns and 14 lingnes is subtle. The different books over the last 70 or more years also have variations as this long lived caliber (They must have made 100s of millions) evolved over time.
One of the watches actually ticking. which is the subject of the watchmaking thread. (this came as a tin of rusty parts) actually there were two watches in the box, but this will be the subject of another thread. (with photographs.)
At the moment I am sorting through hands and push pieces.
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