Dear Barry,
As you can probably tell from the thumbnail - I am very young at retouching. I don't work with old photographs. But I think this method may provide you with some further answers. It comes directly from Photoshop Restoration and Retouching - K Eismann - one of the best books I have ever bought.
You may want to retouch the face using the heal brush (if you use
PS 7.0 or CS). It preserves luminosity and is great.
In the example I have used a part of the Man's skin to generate a pattern and then use the healing brush to go over the right side of the face. It was done in less than 5 minutes just to show you the effect. Done more carefully; I am sure the results will be more pleasing.
Hope this helps.
Best wishes,
Sansuci