Would a 1953 Kaiser-Fraser Manhattan be considered a full-size car or rather a medium size at that time?

I would think it was considered a full-size American car at that time.

The Kaiser-Frazer lines were introduced in 1947-48 as medium sized and priced cars.  The upper limits, such as Frazer's 1951 4 door hardtop and 4 door convertible, challenged Chrysler and Buicks upper lines, as did Kaiser's Manhattan trim line, but all were built on the same wheelbase and the same basic body.  These were full sized cars with large trunks and room for 6 inside.   Only Kaiser's 1952-54 Henry J was a low priced and small car.   Yet Kaiser had only a six cylinder engine.  I like the Esval version also.

With a 118.5 inch wheelbase the Kaiser had a longer wheelbase than a '53 Chevrolet (116") or a full-size Ford Crestline or Customline. (115")

A full-size car in the upper medium price range.  

1953 Kaiser Manhattan 

• outside length: 5363 mm / 211.125 in, width: 1902 mm / 74.875 in, wheelbase: 3137 mm / 118.5 in
• reference weights: shipping weight 1481 kg / 3265 lbs estimated curb weight: 1560 kg / 3440 lbs

1953 Buick Super

• characteristic dimensions: outside length: 5375 mm / 211.6 in, width: 2029 mm / 79.9 in, wheelbase: 3188 mm / 125.5 in
• reference weights: shipping weight 1771 kg / 3905 lbs estimated curb weight: 1850 kg / 4080 lbs

The Esval models are beautiful.  I have the Manhattan and the Carolina.

@whodeytink  And the unique thing about the Esval is that they choose to do the more unusual 2 door sedan version.  These Kaisers may have been one of the first with an optional semi hatchback design with a tail gate and a hatch.