I do know the answer: There is no such thing.
Bob Smalser, a third generation boatwright in the northwest US, and a frequent contributor to Fine Woodworking, gave me a tutorial on this a few years back. Additionally, I got information from the late Chuck Jones, a military consultant and boater who spent a lot of time in that part of Asia and witnessed lumber harvesting in the area in the 50's and 60's.
A lot of the wood used by Chris Craft was from the tree family Dipterocarpaceae, and the genus Shorea. There are a pile of species contained in this family... nearly 200. They are not
mahoganies, but more closely described as a tropical cedar. Their color and density vary fairly widely, but they are not as heavy as either Khaya's or Swietania's, two the true mahoganies. A number of species in this family grow to 250 feet tall.
Here is the wiki entry, although it is brief, given the the number of species:http://en.wikipedia.org/wiki/Shorea
I've done a fair bit of research on this subject, and it's pretty dry, so I won't bore everyone. I do want to mention one specific species of Shorea: Tanquile, or Shorea Polysperma. Chuck Jones told me of this species, and witnessed it being harvested. He also knew that much of it headed for the US. (Can you say 'Millions of board feet'?) Tanquile as a mature Shorea species was slightly denser than most of that family, and exhibited a deeper red as well. It also exhibited a curious reflective sheen when finished well. (Ring any bells?
) Mature forests were found in the Phillipines particularly, but additional timber was harvested all over Southeast Asia. Mature trees were up to 200 feet tall, and had few flaws in cut lumber.
Tanquile no longer exists for practical purposes. It is on the threatened species list, and despite replanting efforts, it will never be a significant lumber in a couple of lifetimes. The Phillipines no longer export it. It was the King of the Shorea family, and was well used by CC.
IMHO, the two best replacements are of the Khaya genus, (Africa Mahogany), and of course Swietania, which contains the true 'Honduras' mahogany species.
If you want too much info on Khaya, here you go. This thesis gives you more information on Khaya that you would ever want:
http://www.collectionscanada.gc.ca/obj/ ... Q33365.pdf
The bottom line is this: Lumberyards look at relative properties before they will classify species absolutely. Many of the Shorea species look like 'mahogany', have great physical properties, and good fungi and rot resistance. So do a number of other
species. There is some amount of Swietania coming out of South America, but the Khaya family is the most available lumber I have seen in the northeast US and Canada. Are we going to run out of the quality we see in CC boats? You bet we are, in fact, we already have. Old growth forests are just that, they take a loooong time to mature, and a forest that takes 1000 years to grow doesn't get replaced.