PSD Headstamp

Picked up some brass a while back. Headstamp says PSD and either 1 5 or 1 4. I know that PSD is for Poongsan Metal Manufacturing Company Ltd., Seoul, Republic of Korea (http://cartridgecollectors.org/?page=headstampcodes#P), but what do the 1 5 and 1 4 mean? Since the primers were crimped, I'm assuming 5.56x45.

The numbers are the year it was made :)

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Originally Posted by papparuff

Picked up some brass a while back. Headstamp says PSD and either 1 5 or 1 4. I know that PSD is for Poongsan Metal Manufacturing Company Ltd., Seoul, Republic of Korea (http://cartridgecollectors.org/?page=headstampcodes#P), but what do the 1 5 and 1 4 mean? Since the primers were crimped, I'm assuming 5.56x45.

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Thanks Wes.;)