Hi Marvin,
Welcome to the 3A Page.
Quebec Jeep is correct.� The "VIN" number will be on your data plate mounted on the fire wall, on the passenger side, in the engine compartment.� The number will start with CJ3A, followed by the number.
If the plate is gone, the Willys could have been titled using the engine serial number.� The engine number will often start with "3J" followed by the number.
A little more information from you will help us with your Willys history.
My Willys CJ3A history.� Data plate serial number...CJ3A 36662. ( very close to your number) My Willys was titled as a 1950.� In fact, it was actually made in late 1949.� It was a common practice back then to title the Willys in the year it was first sold verses the year it was made.�
This is a photo of my plate....

Hope this helps to get you started.� How about some photos of your Willys?
Tim