Most Roskopf watches, usually 18 size, include a couple interesting features. One is that there is no forth wheel, and thus no seconds hand. This simplifies the train a bit. The other is a "platform escapement" whereby the entire escapement is mounted on its own lower plate and is thus removable as a single unit, balance wheel, pallet and escape.
Although these watches are a bit obscure, the designs (and the name) where used by many imitators in the late 19th century.
Show here is a 16 size Roskopf watch in mint condition. It was never sold. It has a string with a lead tag around the neck, and a paper label still on the case back.
This watch, interestingly, does inded have a 4th wheel.
Also note the pin-set mechanism. There is a button to one side that is depressed to engage setting mode.
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