I did some checking on the AMF change. It was in 1951 when Junior Toy was sold to AMF. Trikes at first still looked the same as the pre-AMF models. Just the AMF was added to the decal name. As time went on through the 1950s the decal design changed, as well as the overall design of the tricycles produced under AMF. Eventually, the Junior name was dropped altogether. If the decal had been legible on yours it would have helped narrow down the year made. If you know who it belonged to originally, either your MIL or another family member, maybe you could estimate about when it may have been purchased based on what their age would be now. It's a well made tricycle and certainly worth keeping in the family and even fixing up.
Dave