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http://world.guns.ru/handguns/hg77-e.htmIn the mid-1920s came the third model of the N-frame, that brought back the underbarrel lug. In the 1929 S&W developed new round, .38 High Velocity (.38HV) - a heated-up version of the .38 S&W Special. Since this round was unsafe to fire in the K-framed M&P revolvers, S&W team rebarreled the N-framed revolver for .38-caliber (actually, .355in), and installed a heat-treated cylinder that could hold 6 rounds of either .38HV or .38Spl rounds.
The gun was named 38/44 Heavy Duty (Model 20, since 1956). Similar model with ajustable sights was called the .38/44 Outdoorsman (model 22).