The m1941 Johnson (JSAR) was not produced by Iver Johnson. It
was produced by Melvin Johnson as a military firearm. It lost out
to the M1 Garand in trials. About 24000 were made. Many of these
were remade by a company called Winfield Arms.
A Johnson in military trim and very good condition could fetch
up to 7000 dollars. Most are sold for much less. A winfield Arms
Sporter could get from 2500 to 5000 depending on condition. These
are the numbers I have seen online.