It's a coincidence that I just purchased my first naval dirk and then saw this post. The first one is more of a gambler's type dagger, mid to late 19th century, I'd wager. It could be a "soiled dove's" garter dagger, as this pice appears small enough. The second is a midshipman's naval dirk, early 19th century. Alittle rough, but pretty cool. It could be an American piece, with it's simplicity. I don't suppose it's for sale?