Always interesting how the different races of Chinook have such different body shapes.
I checked just now and the 61 1/2 pound Tyee caught here last year was 50 1/2 inches long and 30 1/2 inches in girth, much less than those short stubby fish from Rivers Inlet girthwise. Being nearly as long and with a much larger girth 75 lbs seems reasonable enough.
The problem is the first pic of this thread makes the fish appear quite short, hence the initial skepticism methinks.
Heckuva fish regardless!!
Well done.
Take care.