SIMPLE ANSWER: No US coin dated 1965, 1966 or 1967 will have a mintmark, it's just a penny.
face value
Face value only.
Assuming you mean a U.S. cent and not a U.K. penny, yes - it's worth its face value, but nothing more.
Canada has not celebrated a bicentennial. The 1967 coin is the Centennial penny. It's worth face value, .01 cent.
A silver penny in mint condition is typically worth around $5-$20 to collectors, depending on the specific type and rarity. A penny from 1967 with a silver front and a goldish looking back may be a novelty coin that has been altered or plated, and would likely be worth only face value as a regular penny.
The last Australian Penny was minted in 1964.
Face value the date is still in circulation.
It is worth 1 cent. I know it seems that it should be worth more, but because there were so many made it isn't.
like a penny or what we value as a penny
A Centennial penny, uncirculated, varies in price from $1 to about $8.
It's worth 2 cents for the copper, but is still common in daily transactions at face value.
Neither U.S. nor British pennies were made of silver. Your coin is almost certainly plated, which would mean it's only worth face value.