The December Christie’s sales had some big prices for ordinary watches, and some good prices for rarities.
I have bumped the 2915s up considerably. These are so rare the prices are based on some very limited private trades and even less examples of auction prices. Also remember the absolute condition of a 2915 is never going to be the same as a nice 145.022, and the value is based more on the correctness of the components, and how actually complete they are with original parts.
See the price chart here