One of the vents looks like something is stamped at the bottom. The other one looks like the E in Liberty is doubled.
Coins are struck not stamped. The first coin is Post mint damage and the second coin has taken damage as well. Thanks for sharing!
The first coin pictured looks like it could be a delamination at Abe's lapel area. Maybe its a struck through coin. Photo of reverse will help with determination.
The second cent may have a partial upper BIE (U1/2). http://cuds-on-coins.com/lincoln-cent-bies/ If it really is there it would be a very minor error and very common on cents from the 50's. The more dramatic ones are fun to collect though.