That will be awesome. We can't begin to think of all the memories it will bring back to your uncle. Good luck. Truck is deifinitely Pre 51 with the driver side vent and full side glass. I had a 50 once and it had the driver side vent and full side window.
I think you can also tell by the handle that pulls the driver vent open. Seem's I read somewhere that the handle on one was flat and on another year make it was different?
If I had to guess I'd say a 50 but some one better at the year model than me will chip in.
Here is a link with a lot of characteristics to help decide what year it was. Enjoy...thanks to Tlederman for posting this link some time ago. Thanks Tim.
http://1954advance-design.com/AdvanceDesignTrucks/AdvanceDesignTrucks.html#1948
