Huge numbers of surplus WWII BSRs were converted to .38 Special by lengthening the .38 S&W chambers back in the 1950s and 1960s. Most were also refinished and had their barrels cut to 2". They were sold by mail order at prices in the $30 range. The grips on it are much newer than the revolver (grips are from post-1969). These revolvers have no collector significance or value. They are purely shooters and worth only whatever someone is willing to pay for a shooter. It should be safe to shoot, but you may see that the fired .38 Special cases are bulged.