Niewmismatic Error Coins

Malaya 1927 KG V 10 Cents With Strike Through Errors.
Rarity:RR
This Malaya Straits Settlements King George V 1927 10 Cents silver coin was lying in the album of a very senior numismatist for more then 30 years. Although it was minted with a minor error, i.e. a Strike Through Error, but it was still in about uncirculated condition.
A Struck Through mint errors is sometimes called Filled Die mint errors because the coin and the die have a foreign object in between during the strike.

Debris, (which can build up around machinery), made up of grease, oil, metal filings, etc., may work itself into and cover the dies. When this occurs it can fill certain areas of design and prevent those areas from being struck up on the coins the dies are striking.
In this case we can see that the reverse was the recipient of obvious Strike Through Errors, likely it was a struck through filings that were accumulated on the dies.The affect areas are from 11 o'clock to almost at 2 o'clock position.