It is a Senator Klassik from about 1999-2000.
By: stromer : December 22nd, 2018-15:01
It contains caliber 39 with a DD chronograph module.
So the reference number should be something like 39-31-...... Jocke will know for sure.
A nice classic design, fortunately without a date as in those days there was no panorama date yet.
Best, Martin