Like others have mentioned, decades of handling causes the wood fibers to themselves be polished. Regardless of the type of penetrating oil you apply, the hardness and smoothness of the wood fibers on the surface are responsible for the look you are going for. Try a little 000 steel wool to slightly buff the wood fibers when you apply another coat of BLOicon, or whatever penetrating oil you are using. Rough wood (how it was originally) will never take on that aged, deep semi-gloss look unless the wood fibers are compressed or smoothed. Handling, and many years of polishing and oiling will create the perfect look, but polishing the wood with a little steel wool, or other fine abrasive, will come close.