Came across a jar of old crystals at a garage sale today. I saved them
from being tossed into the garbage. The home owner says they were in the
house when they moved in and were about to toss it.

I'm going to take them to a swap meet next weekend but there is one item
in the bunch that looks unique. It's a hallicrafter 455Khz crystal filter
in a holder. Looks like one of the crystals except the top is rounded.

http://www.vambo.org/tmp/OldXstals.jpg

I suspect whomever gets the crystals would not have a use for the filter
and it would site on someones shelf. So, I would like to see if anybody
here has a use for it before I take it to the ham fest.