As you may or may not know, Hessian blue was specifically a trim colour for Lombard blue.
In the grand scale of colours I'd call Hessian a very STRONG colour
...thus it's used sparingly.
Hessian really "brings out" Lombard blue as they share the same aquamarine toner and it's a pretty colour combination indeed!
Whatever colour you choose to grace your ride with, keep in mind that STRONG colours tend to generate STRONG opinions.
To paint your Entire Model A with this trim colour I'm sure plenty of folks will say they just LOVE it
......but, you might ponder for a minute how you (and potential passengers) may feel about the occassional negative comment, rolled eyes and smirks which such a strong colour could potentially generate when applied to the entire body?

The Model A has lots of class, everyone loves em no matter what.
....The darker colours just seem more dignified.
*The coupe below was at the Vancouver MAFCA meet. Looking at the colour chart... I feel that true Hessian blue looks slightly more tourquoise green than what we're seeing here.