Hi Jeff,
The keris on the right is not in the correct sheath form, hence it can't exactly be called a tajong. The keris on the left is in the correct sheath form, though the right daun (the up-curling tip) has broken off.
You may have seen these 2 tajongs before - archetypal examples.
http://www.kampungnet.com.sg/modules...view_album.php
http://www.kampungnet.com.sg/modules...view_album.php
Very interesting blade form for the keris on the left though... It's not the usual sort of blade found in a Tajong keris. Judging from the depth of the greneng and the style of the base of the blade, could be a Narathiwat blade, like this: