Interesting post from Pinside:
"Dear Ladies & GentlemenThe logo used on KISS products sold in Germany is slightly modified from the logo used in the rest of the world. The S’s are different. Our German distributor KMS and its customers should be familiar with the different KISS logo. Use of the modified logo is required by KISS and, KISS tells us, by German law. The 1979 Bally KISS pinball used the modified KISS logo on German games.We will comply with KISS’s requirement. The Pro, Premium and Limited Edition KISS games we sell to Germany will have the German version KISS logo. We will sell those games to KMS. To avoid confusion, we will not include German games as part of the 600 KISS LE games we are making. We will make 60 German KISS LE, having its own series of numbers."
For your information : the "ss" as normally used by Kiss was used by the Nazis and its striktly forbidden in Germany nowadays.
The older Bally Kiss Backglasses were also different, but this time it seems the artwork on the playfield also . ( the only reason i could think of why there are 60 extra LEs )