I believe this case to be from Singer. It originally held a Singer 201-2 so it is a full-size case. Some scuffs and marks from use, but sturdy with working metal latches. The posts are included but they are loose and do not have pivoting pins/wires in the slots to tilt the machine up.
It should fit other likewise full-size sewing machines (but I don't believe the 301).
Machine area measurements are: 14 3/4" x 7" x 2 5/8" (to the top edge)
Distance from post to post: 9 11/16"
Shipping is via FedEx Ground.