The aspect that really interests me is on the pic of the bottom short rib, with the number 635 right on it. It's a coloring line, with the inside near the rib and short rib itself appearing blacker, yet the balance of the tubes appearing brown. This shouts to me a touch-up job, in an attempt to improve the tube set's appearance. I think it was done quite a while ago, possibly before it was sold to be gifted.

Regards
Ken

I prefer wood to plastic, leather to nylon, waxed cotton to Gore-Tex, and split bamboo to graphite.