I have a curly maple Pembroke Table and posted about it here:
http://www.antique-shop.com/forums/index.php?topic=7600.15 It has pencil marks under the drawers and the wood is imprinted underneath the front rail. Even with that I am at a dead end on this table. I had a dealer look at it and he thought 1850 by feel of the wood, style, etc but no real concrete proof. You can see pics on the link above.
I have seen these tables for 10-12K as well but I can assure you they do not sell for that price unless the have a provenance, you can prove it was built by a master furniture builder (i.e. Hepplewhite signature on bottom) or some other anomaly. At my major metropolitan antique store there has been a table almost like mine priced at $600 (plus 20% off most days). It has been there at least 9 months with no takers. I could probably sell mine to a dealer for $200ish or roll the dice at auction and probably get the same amount... From my research, the curly maple is more desirable than the dark woods but probably b/c you see less of them.
I don't watch my local Craigslist for these so I don't know my local pricing or if the sell. Wish I could be more help.