Impressive Parking Brake knowledge Captain O! I am often humbled by many members like you on this site and no, just regular Poly. I am cheap and can occasionally be lazy.
You are right TomoHawk, polyurethane clear will yellow. If it lasts, maybe in this case it will give nice "patina" like they say on Antiques Roadshow .
My parents found me under a cabbage leaf there Zup, When it was Waltons 5&10 but was transported out in the second grade. I still have Kin there, although the crowd has thinned. I had a cousin that said we had so many relatives there that he had to go outside the county just to get a date. Even then he had to check the family tree.