I believe it is a bit bigger than that (1/2400) although I’m not certain. I do know that ships and aircraft are different. My models of the biggest ships, (Enterprise, Iowa, Akagi) fit in the boxes they send you new checks in.
Ahhh According to this it is 1:1800 for ships and 1:900 for aircraft.
They are decent enough little models. The rare ships are much nicer than the common and uncommon ones, mostly destroyers and support vessels, which sometimes can look cheap and are sometimes bowed (easily fixed with a hair dryer on low.) But the big battleships and carriers all look okay.
Here is the gallery for the first set at Avalon Hill’s site.
Second set called Task Force. Several repaints from the first set.
The game is pleasant enough as long as you aren’t looking for a detailed and complex naval game.
I was just looking a bit closer at those galleries and the photos are not to scale with each other they’ve pushed all the ships to look closer in size than they are.