Impressive original contractor model of the Skylab space station’s Multiple Docking Adapter by Martin Marietta, measuring 6.25″ x 3.5″ x 3.75″, set upon a metal base, which, in turn, is attached to a wooden presentation display, 16″ x 8″ x 8.5″, with an information label and opposing upright plaques containing artistic cut-section images of the MDA. Includes a Martin Marietta component identification booklet for the Skylab MDA. In very good to fine condition, with evidence of missing paint, which also bears some lifting and cracking; the presentation base and label also bear scattered wear.