Hey Guys, no problem - just trying to be as informative as possible. The pinniped humerus is actually fairly diagnostic (if in good shape) and can often be identified to the genus (however, differentiating between species is often not possible nor kosher).
Now, if that humerus belonged to an adult, then it would be about twice as long. I've seen humeri of a giant late Miocene walrus (Pontolis magnus, to which I apply the nickname 'killer walrus') that are almost 2 feet long; there is also a humerus of Alachtherium (now = Ontocetus emmonsi) from the Pliocene of Belgium that is about this size. I've seen a cast, and the distal end is 2/3 as wide as your fossil is long. Now that thing was huge (and possibly a Pliocene precursor to Odobenus).