Sorry, missed your post! The pictures on TRR are really not the best, but from what I can see, it's all right. Post your own pictures if you decide to purchase it.
Everything looks fine, I'm convinced it's authentic.

These are two different models. PS1+ is always made of calfskin whereas the PS1 can either be made of calfskin or lambskin. It's more structured and has its main compartment divided into two sections. The flap is also one piece of leather instead of two stitched together. The overall look of the PS1+ is a bit more minimalistic. The PS1+ comes in Tiny and Medium, the PS1 comes in Micro, Mini, Tiny, Medium and Large. Also Pouch and Extra Large, but those are discontinued now.