Conservation Showcase: 1917 S USA-Philippines 10 Centavo

Posted on 11/8/2011

A recent example from our conservation laboratory.

BEFORE CONSERVATION
NCS Conservation Showcase NCS Conservation Showcase
click to enlarge click to enlarge
 
AFTER CONSERVATION
NCS Conservation Showcase NCS Conservation Showcase

Issued during the time that the Philippines were under U.S. control, this coin is part of a series popular with collectors both of U.S. coin issues as well as those of the Philippines. The S mintmark on this coin indicates the San Francisco mint and in fact all U.S.-Philippine coins were made in U.S. mints plus a branch mint for a time in the Philippine capital city of Manila.

This 1917 S 10 Centavo coin was stored for a long period in a PVC laden coin holder. The PVC in certain coin holders such as soft flips can combine with humidity in the air and leach out depositing a green residue on the surface of the coin within. This PVC haze can damage the surface of a coin. Luckily for this coin, the conservators at NCS were able to remove the green residue and the coin was able to grade with numeric grading at NGC.


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