Yup, Katie- you got pipe pieces there! Now, with one-piece (meaning they aren't the chunkier ones made to have a reed stem) pipes, the later the date, the smaller the stem hole, so your's, I think, is colonial. Very cool- and as I've always thought, colonists liked the places where N.A.'s lived- good real estate., so you might find much more. I have often found N.A. items mixed in w/ old dump trash. Kinda makes a hunt more complex- as one's eye catched metal, glass, glazed pottery, AND points/tools. I think you may be onro something there- get at it!
Cheers!
Yak