Anybody Know what this is?

I got this in a "buy it all for 5bux" deal at a hamfest. Appears to be a transistor, has 5 pins on the bottom, 2 grounded to the case.

 

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UPDATE 12/14

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Ok, so the camera fone kinda let me down with that pic.

After posting to QRP-L, a consensus kind of developed around the idea of this being a SAW filter.  

Sometime after Christmas, I'll get a dremel tool (currently don't have one, however I am taking Donations, if Sandy Claws is feelin' generous. :-D ) and cut one open.

Update to follow after that!

73,

GB Hoyt

KG4GVL