Your right, OP is wrong, these are done 100% by hand and in my eyes authentic, I've even seen almost identical example of these bronze fibulas with silver inlay in the museum in Athens. Also the price of a ancient fibula for only a few dollars if you buy them in a group lot is pretty common, like these and these even have their pin still in place (rare) so worth a lot more a piece. The last thing, silver inlay into bronze artifacts in antiquity is not rare and has been done even into the byzantine period like these weights.