Help! Which Birkin is this?

Usually, if the bag is 45cm or greater, there will be 3 straps on the bottom. The travel HAC's can also be lined in canvas. This is a common travel size. There's usually at least one on the floor at the store I frequent.
 
Thanks, HermesAddiction, duna, hermesgroupie, for confirming what I thought as well! Hermesgroupie, I also see at least one in the stores frequently, and you're right, there are 3 rows of straps/feet on the bottom. Although the pictures aren't that good, does the leather appear to be Ardennes? Looks like it to me, esp. since it looks like an older model.