I do not know how they are cut but I have a couple of
one kc crystals.  They are rather long and if you thump
the unit with your finger you can hear it ring at 1 kc.

Derward  KD5WWI



----- Original Message ----- 
From: "John Coppens" <john@jcoppens.com>
To: <piclist@mit.edu>
Sent: Thursday, September 17, 2009 8:41 AM
Subject: Re: [EE] LF Crystal Filters


<snip>

> I do have a couple of real old 100 kHz 'stones' here, but they are so
> large you could probably build the watch inside them ;-)

<snip>

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