The "S" on the plate stands for Salzburg, and the number, 26301 means that was the 26,301st registration in Salzburg province after WWII. Interestingly the plate does not stay with the vehicle, but the owner. The plates have a quick disconnect device that allows you to easily change them from vehicle to vehicle. The black plates with white writing were phased out in the 1980s. Now they are white with red writing and an Austrian cross.Lovely 1302 Salzburg rally bug.