![Confused *!@](http://www.aussiepinball.com.au/Smileys/classic/confused0081.gif)
Varta batteries in the CPU from factory.
I could be wrong, but going by the history on the Varta website - it seems circa 1997 as the debut of the battery for the consumer with that brand?.
Either way, great looking machine and certainly in very very very good condition.