Hello, I am helping my dad and I can't seem to find anything to identify the Rollfast other than its a women's bike. The only numbers I think I can find are U - 24894
My Samsco badged Rollfast had the same steel-clad wooden wheels on it. Your fenders and paint scheme look the same as my bike too. Pull the crank and check for a date code on the arms. Mine had what appeared to be a 1933 or 1934 code.