Gentlemen,
I think prices are on a seriously upward trend. Having watched the asking prices and sales closely for a long time, I think this Gretsch kit would have been of marginal interest and price not that long ago, given its late 60's era, the Rock 'n Roll configuration and issues that always developed with satin flame finishes.
A price of $1525 at auction is very good in my view, and perhaps 1/3 higher than it would have been just a year or two ago.