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https://hoursfinder.com/s-hours/systeme-roskopf-patent-hours.html
Details about ANTIQUE SYSTEME ROSKOPF PATENT MEN'S POCKET WATCH SWISS MADE 1900's. 1 watched in last 24 hours. ANTIQUE SYSTEME ROSKOPF PATENT MEN'S POCKET WATCH SWISS MADE 1900's. Item Information. Condition: Pre-ownedSeller Rating: 100.0% positive.
https://www.worthpoint.com/articles/collectibles/history-roskopf-watch
A patent office was not established in Switzerland until 1888. Hence, Roskopf was unable to patent his inventions in Switzerland, although he did manage to patent his inventions in France, Belgium and the United State. The inability to protect his inventions in Switzerland opened the door to charlatans, and he was copied many times over.
https://relojesdeayer.blogspot.com/2014/07/systeme-roskopf-patent-1_10.html
SYSTEME ROSKOPF PATENT 1ª. Vamos a continuar con un reloj, que a diferencia del anterior ha resultado algo más complejo de reparar. Al tratarse de trabajos para adquirir práctica, todas las piezas se han comprado en subastas de eBay, no superando en este caso los 10€.
https://mb.nawcc.org/threads/roskopf-patent-pocket-watch-1a-identification.96150/
It's been discussed before on other Roskopf-related threads on this page. Mikrolisk lists the "Systeme Roskopf 1a" trademark as being registered by Eberhard & Cie. out of La Chaux-de-Fonds, Switzerland, in 1901 (I ran a search using "Roskopf 1a" to get that result).
https://www.youtube.com/watch?v=rmR7vtRbgaw
https://www.collectorsquare.com/en/luxprice-index-watches/roskopf.html
Roskopf, Patent, Swiss Made. Ref. 5178, case No. 50483, circa 1910.Fine and rare, round, early water-resistant, 14K pink gold, mid-sized wristwatch. Description : C. two-body, outer case with reeded screwed-down top and hinged three-body base metal inner case, inner dedicated back Grand Prix, hinged wire lugs. D. white enamel with radium-coated ...
http://www.bathantiquesonline.com/search/antiques-price-guide/roskopf-pocket-watch/results-1.html
Browse FREE Roskopf Pocket Watch Price/Value Guide - Appraisals, Valuations & FREE Sale Advice. See TODAY's Roskopf Pocket Watch for SALE, BEST OFFER and Auction; plus Expert Appraisal/Valuation, FREE sales advice and brokerage services, FREE sale prices, values, wish list and more - FIND 150+ Specialist categories | Bath Antiques Online - Buy, Sell & Value!
https://en.wikipedia.org/wiki/Georges_Frederic_Roskopf
Roskopf was granted US patent No. 75,463 10 Mar. 1868, for a changeable escapement for watches (this patent said that the escapement could be adapted for use with a cylinder or lever as well as a pin pallet). Roskopf patented his watch in France with French patent No. 80611 of 25 Mar. 1868 for a watch with a type of platform escapement.
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