Re: Help Iver Johnsons model??
Welcome to TFF.
Listed in the I. J. book as "New Bulldog Series 1974-78" with a 1975 adv. shown that matches your gun exactly: "Now in Satin Nickel"
Made in .22 LR, .22 Magnum, and .38 Special. Serial number with letter code (K for the .22s) right side of frame. Caliber of .22 Mag version marked on cylinder. Price at introduction for .22 was $62