1938 Wheat Penny Additional Woodies

They are referred to as woodies, woodgrain
Resulted from impurities in the alloy or concentrations of pure copper that did not properly blend with the 5% tin and zinc added to it. When these less than perfect ingots were rolled into strip, from which blanks would later be punched, the concentrations were flattened and stretched into the patterns seen on the finished coins. Invisible when first struck, these flaws appeared only after the coin was exposed to atmospheric agents that caused the copper concentrations to tone more quickly than the properly mixed portions of the planchet.
John1

Thank you

I also have a 1978, 1981, 1982 pennies that look like this are these as collectable?

Not everyone digs the wood grains. But I sure do! Great coin!

Used to be frowned at for Numismatic collections. Now there are collectors popping up more and more for wood grained coins. Values are various due to no one knows how many there are in existance. How many collect them. Not mentioned in most coin books.
As an example note in the Red Book, pages 413 and up on errors, those are not even mentioned.

Ok, thanks just carl :)