I'd be very leery of purchasing any horn over twenty years of age that had parts like wing key guards and the like.
That wouldn't be a turn-off for me. In the last year I bought 2 lovely, and nearly pristine, JK Tonkings from 1957. (An alto and a tenor.) The only thing that was damaged on them was the Lucite angel wing and clothes guard. However, I knew I could get replacement pieces, so I factored that into the price I paid for the horns.
Here's a fun fact many people don't know... JK used metal wings for their Tonekings and The New Kings destined as US exports, and as replacement parts when there were warranty claims. In other words, metal angel wings and clothes guards were not an after-thought on the part of JK. These parts have been around as long as these angel wings have been.
I had a Keilwerth-made Bundy bari from about the same time period as the Keilwerth-made DABICO on the other thread. It only had one of the plastic key guards: the pants-protector one. The other key guards were factory-standard sheet-metal. The plastic guard had some hairline cracks around the screws that connected it to the body, but was otherwise in very good shape. The point being that YMMV.
Both my alto and tenor have the same cracking around the screws on these clothes guards. I don't think anyone's mileage varied. :frown:
There are some folks that make not only a sheet-metal replacement for the plastic wing on the Keilwerth New King/Toneking, but plastic guards for it and the beautiful Conn 28M Connstellation, so there are options. Helen might have some dollar figures. Considering that the 28M reproduction looks almost exactly like the original, I wouldn't say "no" to buying a 28M that's missing that key guard only.
I don't know of anyone who makes Plexiglass or Lucite angel wing replacement parts. I ordered metal wings and clothes guards, because that's all I know that is available, and as I pointed out above, was an OEM part.
My parts arrived yesterday. I ordered them from Gerhard Keilwerth's shop in Nauheim. (His family is continuing to run his business since his death, and has kept his former employees on.) That said, I received an email from a fellow in Vienna who told me that the Julius Keilwerth company still makes these parts as replacement pieces, and that he had ordered replacement angel wings and clothes guards for all his vintage JKs from them. He told me to get a hold of the Buffet Group.
All totalled, the 4 parts, shipping, handling fees in Canada, taxes (both here and in Germany... don't get me going on that one...), and duty, was around $250. Not bad, when I consider that my horns--especially my alto which has all its original accessories, and is 99% intact in the lacquer dep't--are in astounding condition. Furthermore, my tenor has become my main axe, so dropping $125 to bring each horn up to original is not a big deal in my eyes. YMMV, and likely will, but to me, it was an investment in 2 very fine vintage horns.