I've often wondered why there are so many coins from that era which have either a hole drilled through them, or a name stamped on them. I think I now know why.
There is a fascinating article in April's (2016) "Coin News" entitled "Victorian coin defacement". Written by John Robinson, it examines why so many coins did get defaced. People had many novel uses for coins in those days, such that in August 1861, the government decided on a clamp down, as recorded by The Bedfordshire Times:
Customers and shopkeepers then cast much sharper eyes on coins, not only looking for already defaced coins, but also for counterfeits and lightweights. A fad emerged in the 1860's, which involved the use of what was called "The Detector", which was used to dtermine whether or not a coin was fake. A case which appeared in The Kentish Mercury in December 1861, illustrates the use of this device:
It's useful to know why so many coins from this era were defaced, and the above gives an insight into why this happened. Obviously, in spite of the Act, the defacement continued long after. Evidently not too many people were sufficiently bothered about the new law to let it change their habits.