The book "Ford Design Department — Concepts & Showcars" by Jim and Cheryl Farrell devotes a section to the XM-800. It seems that by the early 1950s Ford Motor Company was aware that it needed to fill an upper-middle price range slot that its Mercury brand was not covering well. (This is further explained in Thomas E. Bonsall's book "Disaster in Dearborn: The Story of the Edsel", especially pages 73-74.)
At first, the idea was to launch a more luxurious Mercury, making more use of the name of its brand-topping Monterey line. The sources seem to hint that Monterey or Mercury-Monterey might become more distinct from ordinary Mercurys, perhaps a quasi-new brand.
As it happened, a new brand was created, the famous (to car history buffs and folks my age) Edsel.
Below are images of the XM-800 that provided early design thinking on the project as well as details later used by production Lincolns.
Publicity photo of the XM-800.
Front quarter view, same setting as the previous image.
A 1956 Lincoln. Compare the front wheel opening, "frenched" headlight assembles, as well as the general feel of the front end to the XM-800 in the previous image. Nothing identical, but suggestive that this design theme was in the back of stylists' minds circa 1954 when the '56 Lincoln's basic features were largely set. However, Ford's 1953 X-100 concept car (some background here), featured the same sort of detail influence on the '56s Lincoln. And likely influenced the XM-800 as well, being a slightly older design, though the rest of the X-100 was quite different.
Now for some RM Sotheby's auction photos of the restored XM-800.
Very early-mid 1950s thinking. Panoramic windshield. Long fenderline thrusting fore and aft to enhance both visual and actual length. The rollbar-like C-pillar was chosen because it added freshness. The semi-covered front wheels were retrograde, despite being carried over to the '56 Lincoln.
Rear quarter. Hints of tailfins a few years before Chrysler featured them on its cars. The heavy, chromed rear centerpiece strikes me as being Dream Car fluff, not likely to be retained in full on a production version. An actual production car line would surely include four-door sedans, so the massive C-pillar would have to have been modified or eliminated with respect to that body type.































