Concerto vs. Concerto II

Any advice on whether the Concerto II is worth the additional $? Typically online marketplaces now have a few Leblanc Concertos for $ 975 and Concerto II s for $1500-$2000(new old stock). Other than the silver keys, are there any other differences?
 
Here is some discussion by Steve, one of this forum's moderators:

 
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