Here is a vintage Flexible Flyer Baby Sled Back, new in box, from 1929 or
On one of the metal arms it reads patent number 1714093
It was patented in 1929, by SL Allen and company out of Philadelphia PA
Box has picture on it, box measures 15" x 13" x 1 1/4"
Other than the box having some split corners, everything is real nice!