Quick update, starting with my thanks to everybody that has provided input so far.

As noted in my initial post, everything about this rifle is extremely dry -the stock is by far the driest stock I've ever come across.  The wood is fairly clean.  Also, there isn't any dark discoloration around the action that you see on heavily used guns.  Based on the faintness of the cartouche and inspection marks, I suspect somebody sanded and refinished the stock in the distant past and it's pretty much sat since then.  I haven't seen any signs of 'dirt' in the stock - just age/oxidation, so at this point my plans are to 'revitalize' it, but not clean it.

I started applying raw linseed oil to the wood yesterday morning and have had to reapply several times.  The butt area is still pulling it in, but most of the rest has slowed down drinking it up.  Once the wood is finished drinking oil, I'll begin separating the wood from the metal.

In answer to a question from Whig - the bore looks good with strong rifling.  There is a lot of 'dirt' in it (I hope that's what I'm seeing) so I won't know about pitting until I clean it.  I'll be looking for help in identifying whether the cleaning rod is original or a repop.  You may also have noted it's missing the stacking swivel.  I know those are also readily available, but the early ones are slightly different and may be more difficult to find.