This Barn set measures 21.5″ x 15.5″. This version of the set was first produced in 1950. The sets prior to 1950 had a fish pond instead of the hen house. The barn came with a milking cow, two hens that laid eggs, a mamma pig with two suckling piglets and one sheep. All of the animals were made out of plastic except the cow which was rubber. The pictured box of Keystone Farm Animals is from on of the earlier sets but the cow and pigs are correct to this set.
From my private collection.