cavalry model 1742, made by POTZDAM MAGAZIN   S&D  (Splitgeber & Daum), on butt plate FR = Friderius Rex, King of Prussia 1740 - 1786, who calls it "Husaren-Pistole".  The caliber is ~17mm flint-lock smoothbore.

model 1789 
the major change is the use of a shorter 11" barrel compared to model 1742, the same caliber and most other features similar. The maker is POTZDAM MAGAZINE, but now owned by DSE = David Splitgerber's Erben. FWR = King of Prussia Friedrich Wilhelm II 1786 - 1797,

model 1809
after the Paris convention 1808 the Prussians changed to pistol models with shorter barrels, either newly built or recycling damaged parts. In this case the barrel of the model 1789 was to shortened to the new regulation 8" (241mm) and using the stock of two broken pistols.

model 1823, originally issued as flintlock pistol. In 1850 the Prussian government decided to convert the pistols to the more reliable percussion ignition, changing the lock and equipping it with a safety-lid.

This pistol was made 1829 in Potsdam, and the conversion happened in 1851.

model 1823, originally issued as flintlock pistol. In 1850 the Prussian government decided to convert the pistols to the more reliable percussion ignition,  changing the lock and equipping it with a safety-lid.

This pistol was made in Suhl, and the conversion happened in 1850.

model 1850, made by S&C in Suhl, cal. 15mm smoothbore, 

model 1850, made by G.S. = Gewehrfabriken, Potsdam, cal. 15mm smoothbore,

... Auch die preussische Gewehrfabrik Saarn war ab 1851 an der Herstellung beteiligt. Wegen wiederholter Probleme während der Produktion wurde die Fabrik in 1862 geschlossen und die Herstellung nach Erfurt verlagert.
... Also the Prussian Gewehrfabrik Saarn was involved starting from 1851 in the production. Because of repetitive problems during production the factory was closed in 1862 and the production was shifted to Erfurt.
 

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