Here's what my references have to say about EIG firearms.
Saul Eig, doing business as EIG Cutlery
1956 - 1968 Eig converted Rohm blank revolvers into firearms. Most of EIG's handgun models could not be imported after 1968. After 1968 EIG assembled a few models in the U.S. with imported parts. Many of EIG's products were sold by FIE. After 1969, EIG went out of business and many of their models were redesignated and taken over by FIE.
The E-2 shows to be a 6 shot, .22 revolver, Rohm RG10 chrome frame. made from 1957 to 1963.
Value of these revolvers can be from $35.00 to $125.00 depending on condition. They are shooters, not collectors.