According to an article in Vapentidningen no. 7 2000 by Jens E. Perto
Carl Axel Theodor Sjögren had three Swedish patents from 1900, 1903 and 1905 linked to the gun. A Swedish trader called A. Karlsson ordered 5000 guns from Töjhusafdelningen och Haandvaabenverksäderna in Copenhagen Denmark in August 24 1907. Only 12-bore guns with 70-centimeter 3/4 choke barrels were made, but an extra 500 60-centimeter long barrels with cylinder choke were also made. The last gun were manufactured in 1909. Serial numbers from 1001 to 6000.
Weight 3.3 kg.
Length: 123 centimeters, only one stock lentgth were made but you could order it with butt plates in several dimensions.
Barrels made from Special Steel from Fagersta Bruk Sweden.
In a W.J. Jeffery catalog from 1912 it sold for £12. (A Browning automatic was £9)
