Try Saddle Soap as the first option. Anything more aggressive will tend to
damage the leather.
If this does not work then you could try coloured [shoe] polish, which will
effectively re-dye the leather, choosing a shade darker. You will need to
polish this well, otherwise you will stain your clothes when you sit in it.
If you can work out what the stain is you might be able to try some of the
milder removal agents (e.g. white wine to remove red wine stains).
Where is it staining? Are you sure it's not light damage? Is it stained
and rubbed down in the area where the driver is sitting or is it uniform
or splotchy or just at the seams?
The good news is that this is real leather, so you can have an upholstery
place re-dye it.
What have you been using on it over the years? Lexol? Neatsfoot? Something
"C'est un Nagra. C'est suisse, et tres, tres precis."
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