Dear colleagues, perhaps there are Iver Johnson collectors/experts in here, or someone who can point me to the sources of info about this firm. 
Iver Johnson single shot, under the name of Izh-5, was one of the most popular shotgun designs in Russia/USSR until late 1940s. It was first introduced into Russian market by Petrov's Manufacture some time before 1900, as this fragment of a barrel testifies: 
The company's archives were destroyed during the Civil War (1917-1921) and so it is difficult to tell whether they retailed or made Iver Johnsons or both, and from what year. I hope that some documents of Iver Johnson survive which can help throw light on this question. 
P. S. Apparently, Petrov's Manufacture had strong ties with American gunmakers. They also used to make single shots on Remington Falling Block actions, both rifled and shotgun, first by converting redindant military rifles, and then on actions obtained from Remington, as the design proved popular. 
Last edited by Humpty Dumpty; 08/28/15 07:34 AM.