Deuce ´n ´half ID

[Jan Mostek]

Hi guys,
One Czech vehicles enthusiast sent me the picture below asking me if I knew something about the GMC trucks used by the Czech units in allied forces. For me it was the first time when I saw the deuce´n´half with the CS marking. But is it really GMC CCKW, or isn´t it Studebaker? Is it possible to find more details about teh L number? I know it is not very well readable, my best guess is L1278797, but could be wrong and could not be original Czech vehicle as well as Czechs were know that put into service all wrecks they found abandoned along the roads. Any thoughts or ideas?

Happy searching, Jan.