How do you accurately measure DEPTH of a rowboat?

[Brian Smith]

I was gifted either a 1949 or a 1954 Aero Craft rowboat.  The only discernable variation I have discovered is the depth.   A 1954 has a depth of 22.25 inches while a 1949 has a depth of 19 inches. I can get close to both depths on various parts of the boat so my question is,  exactly where on the boat do you measure?

[fishinwrench]

Yours is a 1954   22 1/4" 

[Brian Smith]

Really,  because I measured first by myself.   Then later,  with help and my measurement never went over 22 inches at the very highest outside edges.   The majority of the boat was 19.  So,  i concluded it had to be the 49

[Brian Smith]

Really,  because I measured first by myself.   Then later,  with help and my measurement never went over 22 inches at the very highest outside edges.   The majority of the boat was 19.  Can you explain?

[fishinwrench]

I'm just going by the serial# 

The 1949 model B was a cable steer little center wheel runabout.