vdb
Stamp collectors are call philatelists. Coin collectors are called numismatics.
No mint mark simply means it was minted in Philadelphia. It's not a rare coin, and is currently worth about 5 cents.
They are not rare.
Rare Coin Wholesalers was created in 1990.
You can buy them at coin dealers and coin shows.
Just the year does not make a coin rare.
No, they are not rare.
It has a face value of one cent. It is not very rare and you can by a copy for the minimum stamp fee of about 20 cents.
It means that the coin is rare. For example a 1909-S VDB cent is a key date. This coin is rare.
No.
Determine how many were minted, when and where and the numismatic grade and, last but not least, the availability of the coin for purchase
No and they will never be rare.