Subject: Two western men
Date: The seller dated the photo to c.1875. The back of the card gives the photographer's address as Queen's Road, without any number. There is also a number for the negative, 1723.
Format: carte de visite
Photo courtesy of The Pottinger Hong Kong hotel.
Trivia: In an early example of photoshopping an image, either the photographer or the owner has darkened the light patch on the head of the man on the right, probably to hide any suspicion of baldness!