That's a nice one. Should be a good tough machine. I love these straight stitchers. About the closest anyone will be able to get is mid to late 1950s for a date. It has the more squarish waist and the blue tension dial that my twin (Brother and Morse) clones have and my Brother is from around 1955 to 1957. The decals on yours are also real similar to mine, could be from the same manufacturer.
Cari