Around that time, I managed a hi-volume sporting goods dept, and Model 60's were one of plagues of my life. Constant returns on them, after little use. Most were shipped to the factory for service, but it was always on FFL logging; time consuming. So, my opinion of the guns was not good, at that time. The paperwork, labor and shipping costs on one of them pretty much wiped out their initial narrow profit margin.
However, over time I found, as noted above, that each Model 60/99 firearm can be a law unto itsownse'f: from potential tomato stake in the garden, to a decent .22. As well, I read an article in one publication or another, which stated that cleanliness is next to Godliness so far as reliable functioning.
So, for what it's worth, if the gun shoots accurately enuff for you, and functions OK, then have at the beautification attempt. Practice makes for improvement, tho' not always 'perfect', when it comes to wood and finishes. And, creation of a little beauty in this world, has it's own satisfactions