because we have no facts about the production of the Dreyse double I can only try to find some key data

the original needle fire double gun was developt by Franz Dreyse in 1856 and was more or less like this:

it was very close to the military needle fire rifle and shoot a pure paper cartridge, the illustration found in Zimmer " Die Jagd Feuer Gewehre" 1877 showing a break down action with the well known underlever. this 1877 edition was the second and Zimmer describe this as the old model not in production anymore so I think it was the the state of the art in 1869 when the first edition came out.

this gun number 7506 looking like this first model in some points. the barrels turn to the right side but the breech have two bolts which grib into the barrels end and close it
what I can read there is Cal. Randschlussspiegelpatr. 0,71" in te action what gives a new mystery. why not 0,70" and why are there no ectractor hooks? probably we have an early transition gun around 1870 but the 0,71" cartridge designation is also on another dreyse gun so I think there must have been another cartridge standing between the old paper cartridge and the Schlussspiegelpatrone.

the following illustrations show the "new" model but only with the cartridge ejector hooks on the underside of the action in 1876. the hooks on the action to grip the rim from above also are described as a new invention in the text.

this will probably date guns with the upper hooks made after 1874/75

I dont know when dreyse start to make this gun for Lancaster shotgun and centerfire rifle´cartridges also. the 24ga/11mm gun numer 21144 is not wide from my own needle fire project in 074" with number 21111 so its clear Dreyse make needle and center fire guns like they had orders

this 1891 illustration showing the upper grad model for center fire cartridges but it was not the last. many years ago I had a beautyfull 16 ga in my hands that was for sale by a dealer from denmark.
very long barrels maybe 80 cm and a nice fox in silver on the action but the barrels break again and did not turn to the side. never see such gun again it must have been on of the last made before 1994 when Franz von Dreyse died.