This weekend, I found mint US mono copies of Astrud Gilberto's "The Shadow of Your Smile" and "Look to the Rainbow". Both have delete punches in the lower left corner. Interestingly, one is a deep groove pressing, on quite heavy vinyl, while the other is not and is on thin vinyl. Since they are both obviously deletes, I am assuming they date from the same time period. The differences I describe must be attributable to pressing plants. Can anyone help me out here?