What year?

A clock was a factory accessory for only 1954/55 Advance-Design and New Design trucks.

http://www.1954advance-design.com/Documents/Accessories/Booklet/Page15.jpg

http://www.oldgmctrucks.com/page0149.html

Last edited by tclederman; 02/21/2015 3:32 PM. Reason: added 54/55 GMC clock link