These models are similar to the one you are viewing.
.38 centerfire cal., 5 shot, 3 1/4 in. barrel, nickel finish, hard rubber grip panels with owl's head at top, marked on barrel top rib with patent dates and "Iver Johnson Co. Worchester Mass." marked on barrel top strap, with model name "SWIFT", does not have hammer the hammer action, only sold through J.P. Lovell Co., 16 7/8 - 17 7/8 oz. Mfg. 1890-1894.
.22 rimfire cal., 6 in. barrel, flat side with round bottom, full length top rib, adj. sights, does not have hammer the hammer action, combination of earlier Champion single action and .22 Supershot Third Model, has Champion single action mechanism and barrel, grips, and cylinder of the .22 Supershot, unfluted cylinder with recessed chambers and flash control front rim, 30 oz. Mfg. 1955-1957.
same model as the U.S. Revolver Co., except for markings on the barrel, large and small frame, does not have hammer the hammer action, top of barrel marked for .38 SMITH & WESSON cartridge" (or .32 for small frame), and "SECRET SERVICE SPECIAL" on left side of barrel, main ser. no. location on left side of grip frame, mfg. for Fred Biffar Co. of Chicago., four other companies also manufactured this gun - Meriden Firearms Co., Hopkins & Allen Firearms Co., H&R Arms Co., and an unknown Spanish company. Mfg. 1912-disc.
.22 rimfire, .32 or .38 centerfire cal., large or small frame, blue or nickel finish, 5 or 7 shot, 3 or 3 1/4 in. barrel (5 in. barrels have been seen), does not have hammer the hammer action, safety notch on hammer, hard rubber grips with U.S. at top, oversized two piece hard rubber grips optional, brand name revolver mfg. by Iver Johnson's Arms & Cycle Works sold through the wholesale trade, never listed in any IJ catalog, although it was listed in some European catalogs as an original Iver Johnson product, main ser. no. located on left side of grip frame, 12-17 3/4 oz. Mfg. 1910-1935.
.22 rimfire cal., blue finish, 8 shot, 6 in. barrel, oversized checkered wood grips, hammer the hammer action, cylinder with recessed chambers that full enclose the cartridge case head, large frame top break, left side of barrel marked "22 SUPERSHOT SEALED EIGHT", main ser. no. located on left side of grip frame, ser. nos. below L26601, 24 oz. Mfg. 1932-1941.