I did a little research this morning on the subject. As with all things Porsche, there will always be discussion and doubt. What turns up is that Targas were maybe less likely to get the AL deck lid than coupes. In fact, a thread on the Early S Reg states that most '69-'71 S coupes got the AL lid. They don't talk much about the Targa except to say that it happened after '60
"Standard from 69-71 on most coupes. I only base my conclusions over the last nearly twenty years on perfect original unrestored cars with ZERO paint work, and I have taken note on each one. In nearly every case you will find the aluminum deck lid. The lids are fragile and suffered from damage and were likely thus replaced with steel. The rear wiper was not an issue with the alloy lid nor was the A/C, my A/C 71S has the best shape alloy lid I have owned. In nearly every case of "my car doesn't have one" or "my car has one" the car never has original paint (even thought the owner cant tell the difference) and/or little documented ownership history with interviews of every owner, so I throw those cases out the window along with "my car had a CD player, a special 2.5 liter 400hp engine with limited slip from the factory". You have to adopt a standard with ZERO compromise on authenticity. If I see a 69-71 S coupe with no alloy lid, my response is that it is missing. If you dont agree than show me that the car is 100% original paint with full ownership documentation with past owner interviews. If you cant than I will show you the factory manuals and several example of the standard. The standard in my opinion on nearly all 69-71 S coupes is alloy, so if you dont have one, then get one.......besides any guy with a 69-71 S coupe with no alloy lid will only make excuses..... until he is naked in the shower alone wishing he had one.....that is the acid test to the standard." —schmidt
Aluminum Deck Lid Trivia?