well, UMI or not the USA models are substandard ( compared to the Super 20 standard that is) Super 20
The keys that are nickel silver are the keywork not the keycups.
These are the official 20 improvements, it they are not there it is NOT a Super 20
( well also Cleveland engraved ones lost some of these improvements at some stage, the triple strap ring for example was discontinued in all Super 20 already in some Cleveland)
I agree 100%! But a sax stamped with "King Super 20" is still a King Super 20! Doesn't matter when it was made. But I would say a H.N. White or an early Seeburg S20 is the right thing. I've owned three S20*. The best for me to play was a 66-68 S20! The -52 full pearl was a looker! The -83 S20 was IMO not a KING S20. Not bad but.... A well setup Amati or B&S Blue label was nearly as good as the late S20's. And you could get three of these saxes for one S20's.
Among the American manufactors it was just "The Martin ..." that were roughly the same sax/constuction in the end as it was when it was introduced. Ok, they dropped the adjustable rh hand thumbrest but other wise they never dropped the soft soldered tonholes. Big differences between an Conn Artist 10M from the late 30's compared to a late 10M from the early 70's. The same goes for Beusher 400. And S20 from the late 40's compared to S20 from the early 80's. If you are going to by a late american vinatage sax you should play it and compare it to the right thing. I've seen late S20's that were sold for nearly the same money as a H.N. White S20.
I had some contact with persons at "UMI" and they worked hard to make saxes that was entirely made in USA. And the last models were not bad compared to other manufactors from that time. They didn't reached to Keilwerth, Selmer, Yanigisawa, and Yamaha standard. But better most ROC made saxes from the mid 90's. And all UMI saxes were entirely made in Nogales, Arizona, USA. The exception was the brand "Musica". But UMI was very clear about this in their sales broschure.
Milandro, thanks for the info.
Back o topic. Don't buy the S20 if it's a late one, unless the price is low. The are not bad saxes but there are lots of other good used saxes on the market that are doing the job better.