If you have a Becker Mexico or Grand Prix I think it may have recently become signifiacntly more valuable. It appears that Becker have decided to drop the Mexico and Grand Prix from their catelogues due to falling sales in the face of competition from lower end companies who are providing integrated units with more buttons and readouts than one could use in a lifetime.
I discovered that you can still get them repaired but that may not continue for ever. Some retailers have limited stock that...