Here is a shot of Irene’s taken yesterday

Versus how it used to look as the Short Stop

The exterior doesn’t look like the fluting is original, it reminds me of the replacement material used on Mel’s diner, the former Lincoln diner of Lebanon, PA.

The former Short Stop diner was also known as the Time Out Diner. It’s a 1950s kullman dinette.
Other similar models include the:
White Crystal, which has a reversed floorplan, with the corner door on the right, and the White Rose System of Linden, New Jersey.

Both of those diners, however, have canted corners, identifying them as later models. Irene’s is an earlier kullman, with flat vertical sections, and a four window front facade, instead of a five window. Earlier model Kullman dinettes retained the corner door, but had rounded windows.