That is because early coins were not perfectly round and could easily be clipped or shaved before they were passed on. An enterprising person could thus salvage a small bit of precious metal from each and accumulate a tidy sum.
यह इसलिए है क्योंकि पहले के सिक्के पूर्ण रूप से गोल नहीं थे और हस्तान्तरित करने से पहले आसानी से छील या काट दिए जा सकते थे ।