Proof 1829 Dimes are exceedingly rare. We know of at least five different examples, with rumors of perhaps one or two more. Eliasberg had two Proof 1829 Dimes, both of which were different die varieties. His JR-7 example sold recently (2015) as a PCGS PR66 for $70,500, almost exactly double what it sold for in 1996.
Many of the listings in the PCGS Auction Price Realized are duplicate offerings, plus there are a couple of appearances where the coin was a questionable Proof (this is especially true for any of the JR-3 variety). In the final analysis, any true Proof 1829 Dime should be recognized as a significant rarity.