Well said...you're correct that it's not rare or valuable like a Rolex. My reason for bringing up a sub is that (other than the 6159 and 6215), this is kind of seen as the "granddaddy" of Seiko professional divers.
I'd never suggest doing something for investment sake, but I suppose your question about where we place the 6217 in the scheme of things is a highly worthwhile one to ponder! Personally, I don't ever see these going down in value and where they're priced today (call it $1200-1700), they seem poised for more appreciation as they're relatively easy for people to afford if on a Swiss budget.
By the way, to the OP, what do the hands and bezel look like?
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