Okay, hate to appear to be a dolt, but...

[Darreld Walton]

What exactly is "coachwood"?

[Randy]

Coachwood is from a tree grown in Australia.

[Parashooter]

Ceratopetalum apetalum, the coachwood, scented satinwood or tarwood, is a medium-sized hardwood tree, straight-growing with smooth, fragrant, greyish bark. It is native to eastern Australia in the central and northern coastal rainforests of New South Wales and southern Queensland, where is often found on poorer quality soils in gullies and creeks and often occurs in almost pure stands.

https://en.wikipedia.org/wiki/Ceratopetalum_apetalum

[Dolt]

I resemble that remark!!!

[JB White]

Coachwood got its nickname from being a principle wood in the making of Australian coaches and wagons.