What caliber is it and what is it worth
Numrich (Gun Parts Copr.) has some Iver Johnson parts.
Iver Johnson
A .22 caliber Iver-Johnson Cadet revolver.
try eBay
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Model 1901 Iver Johnson, semi-hammerless, automatic ejector single gun.
Up to 9
Numrich gun parts.
4092
Iver Johnson went out of business in 1993, reorganized, and came back in business in 2004. Their web site is http://www.iverjohnsonarms.com/
A Great source of information on this firearm (and most other Iver Johnson firearms) is the book by W.E. Goforth titled, "Iver-Johnson Arms & Cycle Works Firearms 1871-1993".
there is no REAL value to Iver Johnson guns. so, it does not pay to pay for repairs or buy parts to repair same unless it is an heirloom and you wish to keep it. for parts try: gun-parts.com if still looking for parts