That's a
very good question! We don't know where they were minted, but my guess is that first Herod, and then the
Romans, would have
had that
mint firmly under their control, away from such a volatile city as Jerusalem, as a
bit of extra leverage on the Temple. My guess would be
Caesarea Maritima, but it is a guess.
When it came to interpreting the Law, the Rabbis
had a principle, prabably inherited from their forebears, that when two commandments conflict, one overrides the other. So bearing burdens on the Sabbath might be forbidden
work, but if someone needs rescuing from a fire, the commandments about doing
good and saving life take priority, and you bring a ladder anyway to get him out. Interestingly, the author of the 'Damascus Covenant' took the opposite view: 'Should any
man fall into water or [fire], let him not be pulled out with the aid of a ladder or rope or other utensil'.
Presumably, since the Jews probably didn't have access to silver to
mint their own coins, and certainly
had no silver
mint, they
had to use what was available. They must have taken the commandment to use pure silver as overriding the commandment to abstain from images, which wasn't always strictly observed anyway. As the situation deteriorated in the run-up to the First Revolt, they seem to have become stricter, and to have adopted something which we would probably regard as fundamentalism; it's a common reaction when a religious community feels itself threatened. The images on shekels must have ceased to be seen as acceptable, by some people at least, and as soon as the rebels took control of the Temple, they started producing kosher, image-free shekels. I imagine that they must have used the Temple treasury as the source of the silver, since there wasn't really anywhere else they could have got significant quantities from.