If you're referring to the number I listed, that was the APBA hull number. It identifies a boat as follows:
first two digits are the year the boat first ran, 1973 in this case
the remaining digits are the "U" number on the boat, in this case U-25
Okay, with all that said, there are four pictures of the boat in that screen shot:
Left column second picture shows the Pak racing the 7025 Miss Budweiser in Miami in 1973
Left column middle picture shows the Pak being pulled on it's trailer in 1973. This picture shows how the orange on the trailer matches the orange of the stripes on the hull. As restored, they no longer match as the orange on the hull is darker
Right column middle picture shows the boat returning to the dock in Kennewick Washington with second driver, George Henley. This means the shot is from either 1974 or 1975
Right column fourth picture shows the boat in a half sunk condition after throwing a propeller blade at the 1973 Gold Cup. This is the only picture I've ever seen that shows the boat at a race with the engine cover actually installed.