There are crystal made cheaply and then some made with more labor and usually are more expensive. Better ones are slowly ground to frequency. Cheaper ones are ground "close to frequency" and then "doped" to bring them on frequency. This process is faster then the prior one. However, the doped crystals will "drift" with age a lot more then those which have not been doped to get them on frequency.

Lee Bahr
w0vt

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