This is a wonderful mid-century-era baby jumper.  The manufacturer is not known but is believed to be a Teeterbabe jumper.  Appears to be pre-1950s.  It is in very good condition for its age. The material portion of the baby jumper was redone at some point but is coming apart.  New material may be needed.  

It rocks like the old metal outdoor rocking chairs and would make a nice display in a baby's room or for a life-size doll.

See photos, which are part of the listing.