Got one close to yours at serial number 57386 with shipping date of Nov. 1950. It would only function in double action until I replaced the hammer. Knowledgeable forum members diagnosed the hammer issue and now this Lil Darlin shoots like it should.
BTW, these leaf spring versions are not too common. Hope your truck has nice carpet and climate controls. Treat her nice.
Congrats on your new addition.
Ray