To give you a very rough idea on pricing this one, also a 2471, just sold at auction for around €3500 and is in good original condition.
That's a steal at €3500. I've seen listing prices on eBay at $8-$9,000 and this one at goldammer.me sold at €11,900 (not sure everything is original either given that the minute hand extends past the minute markers).
If you're interested in that look (triple date moonphase), check out this thread. There were plenty of brands that produced that same configuration. Those can be had at a fraction of the cost as an Omega at the same or better condition.