Eggs with very thin shells, or no shell at all around the shell membrane, look unattractive and are highly susceptible to damage.The egg in the photograph has been placed over a bright light. This is the way it would look to a candling operator.
The incidence of these eggs varies from about 0.5 to 6%. They are commonly produced by pullets coming into lay, particularly by birds that have matured early. Some birds continue to lay this type of egg.