Tall, slender build but well-muscled, like a runner or swimmer. Pale skin, mid-to-dark brown hair, dark eyes, neatly combed (though it gets a little tousled in the front if left to its own devices) and immaculately dressed in a fashionable, high-quality suit and gray top hat. Wears a small pair of golden spectacles when reading.
A quick quibble from the play thread: last name is Chamberlain, not Chamberlin. Many thanks!

Equipment:
Various suits of fashionable clothing, including gloves, hat, cane and glasses, pocketwatch and a good overcoat
Ludicrous amounts of money
Excellent quality fencing blades and related gear
Sprawling mansion (now on fire) and multiple smaller residences around the globe
Business connections
Various transportation such as horse carriages and a small rowboat for fishing
[What other things does a gentleman of quality usually possess? I'd have to research to get a full list, but from the cliches, you get the idea.]
Picture of Mr. Chamberlain can be found here:
http://www.flickr.com/photos/30259650@N04/5457523568/