I thought I would collect the most recent ones I have seen (good or bad) via eBay, Chronotrader, and a dealer where I had the info handy (I haven't listed all dealers that have them available right now).
I guess we will find out about the latest 2447T value tomorrow (see current T auction below)

2447 sales/offers since Fall 2016

2447T, 1st execution: current bid (auction ends tomorrow) is $12,400 for US purchase [Christie’s Online: https://onlineonly.christies.com/s/christies-watches-online-springtime-switzerland/heuer-carrera-chronograph-wristwatch-ref-2447-t-64/41101]
2447N, 1st execution: ask $19,400 [dealer in UK]
2447T, 1st execution: ask $18,100 [dealer in UK]
2447S, 1st execution Fisher dial (May 4, 2017): $8,800 [eBay from Matt Bain]
2447S, 2nd execution (April 4, 2017): $5,499 [eBay from mentawatches]
2447D black, 1st execution (May 9, 2017): $8,080 [eBay from Australia]
2447S, 1st execution (May 4, 2017): $4,551 [eBay from Lima, Peru]
2447D blue, 1st execution (Oct 26, 2016): asked $10,400 [Chronotrader from TX]
2447S, 1st execution (August 30, 2016): asked $7,300 [Chronotrader from France]

Additional detail on the above for reference:
2447T, 1st execution: current bid $12,400 for US purchase [Christie’s online]
https://onlineonly.christies.com/s/christies-watches-online-springtime-switzerland/heuer-carrera-chronograph-wristwatch-ref-2447-t-64/41101

2447N, 1st execution: ask $19,400 [dealer in UK]
2447T, 1st execution: ask $18,100 [dealer in UK]

2447S Fisher dial, 1st execution (May 4, 2017): $8,800 [eBay from Matt Bain]
Some aging to dial
http://www.ebay.com/itm/Heuer-Carrera-Fisher-Vintage-Mechanical-Chronograph-Watch-2447-2447D-Circa-1960s-/132173235498?hash=item1ec623852a%3Ag%3ABscAAOSwT-FZAkYo&nma=true&si=c0lUKLPhkT69%252B%252B0hbZVz6ORN4iU%253D&orig_cvip=true&rt=nc&_trksid=p2047675.l2557

2447S, 2nd execution (April 4, 2017): $5,499 [eBay from mentawatches]
Unpolished case, flaw on dial, 92XXX
http://www.ebay.com/itm/Vintage-Heuer-Carrera-Chronograph-Ref-2447-Valjoux-72-Wristwatch-/201880010412?hash=item2f00fc7eac%3Ag%3AI1UAAOSw3utY48Pt&nma=true&si=c0lUKLPhkT69%252B%252B0hbZVz6ORN4iU%253D&orig_cvip=true&rt=nc&_trksid=p2047675.l2557

2447D (black), 1st execution (May 9, 2017): $8,080 [eBay from Australia]
Wear on crystal, rust (?) on exterior around movement
http://www.ebay.com/itm/Vintage-1960-039-s-Heuer-Carrera-Manual-Chronograph-Men-039-s-Watch-Ref-78143-Valjoux-72-/172657432250?hash=item28332f56ba%3Ag%3AUmEAAOSw7GRZCS9w&nma=true&si=c0lUKLPhkT69%252B%252B0hbZVz6ORN4iU%253D&orig_cvip=true&rt=nc&_trksid=p2047675.l2557

2447S, 1st execution (May 4, 2017): $4,551 [eBay from Lima, Peru]
Dial in bad shape, hour/minute relumed, some hands replaced
http://www.ebay.com/itm/VTGE-RARE-EARLY-HEUER-CARRERA-Ref-2447S-CHRONOGRAPH-1968-69-FULLY-ORIGINAL-/152454004516?hash=item237ef77f24%3Ag%3A3bIAAOSwo4pYiRrd&nma=true&si=c0lUKLPhkT69%252B%252B0hbZVz6ORN4iU%253D&orig_cvip=true&rt=nc&_trksid=p2047675.l2557

2447D (blue), 1st execution (Oct 26, 2016): asked $10,400 [Chronotrader from TX]
http://chronocentric.com/forums/chronotrader/index.cgi?md=read;id=58652

2447S, 1st execution (August 30, 2016): [Chronotrader from France] asked $7,300
Look like 2nd execution hands (or maybe just a reflection?)
http://chronocentric.com/forums/chronotrader/index.cgi?md=read;id=56035

: I'm not new to vintage watches, but I am new to vintage Heuer.

: I've been bitten by the Carrera bug, so I'm getting familiar with
: current pricing. In vintage shops with a good reputation for
: Heuer, it's now common to see $11-$15K for clean,
: first-execution examples of 2447S, 2447D, 2447T (with the T
: commanding the high end). But even on eBay, no decent example is
: going for less than $8K. And anything with clear authenticity
: and quality, $10K+.

: I wish this bug had bitten me a decade ago...

: -Josh