>
>I burnt out a few 32Khz crystals using the PIC before I realized that I
>needed a series resistor of about 10K or more. I think only the low
>frequency crystals are more prone to burning out.

The watch xtals are designed to operate on absolute minimum
energy (for obvious reasons) and ANY crystal can be destroyed
by too much energy.

A uP is probably a bit hot for watch xtals, but anything in the larger
cans should be fine. (I've never seen it be an issue in 15 years)

There used to be xtals in a case about 1" x 1.5" x .5", and it was
fairly common to use those at .5 - 1W in single tube transmitters.

You could also take them out of the case and lap them to a higher
freq or rub a little solder on them and lower the frequency.