If you mean a Lincoln cent date 2010 or 2011 it's the Union Shield. If not, post new question with a date.
It means that it was made at the San Francisco mint.
The "D" indicates the coin was minted in the Denver mint
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You probably mean date. Series is used when identify paper money. The date is on the right side on the front.
Cents struck at the Philadelphia mint don't have a mint mark.
"D" under the date on a Lincoln penny denotes it was minted in Denver.What_does_the_D_mean_on_a_US_pennyWhat_does_the_D_mean_on_a_US_penny
If by a "silver penny" you mean one of the 1943 steel cents, then in mint condition it's worth a dollar or two. If you mean some other date, then it's silver plated and has no collector value. And your 1967 penny has been altered -- no added value.
If you mean a US small cent (1856 to date) the diameter is 19.2mm and the thickness at the rim is 1.55mm.
Please be more specific and post new question with the date of the coin.
Assuming you mean a British penny, a used example will probably fetch £2 GBP in 2012. An uncirculated coin in brown colour will set you back in the region of $8 in 2012. Remember do not clean your coins! If you mean an American cent, it's only worth about 2-3 cents, since it's a common date.
Wow!! That's Creepy