The Model 75 was made in two different versions. #1 was Target Rifle with the 28 in. barrel. #2 was the Sporting rifle with the 24 in. barrel.
Supposedly almost 89,000 of both versions were manufactured over a 20 year period between 1938 and 1958, except the war years when production shut down. The Sporting version is worth more money to collectors just like the Sporting version of the Model 52.