Wrong answer Munkey...

... I would have PM'd you the following information, but as you have contact from me turned off, guess I have to answer this way.

The US Mint has a first strike "program". Coins struck within the first 30 days, regarless of the number, are considered first strike coins. Coins released from the mint during this time have papers issued from the mint stating it is a first strike coin. The grading service (PCGS & NGC) MUST have this paperwork in order to label the coin as First Strike. First strikes cannot be crossed-over, as the TPG keeps the original paperwork when slabbed, so there would no longer be any way of proving first strike status. SO... there really is a record of the number of "First Strike" coins coming out of the mint. The Mint just has not seen fit to advertise that information.

2005s Sac