The attached photos are of an original console ashtray from our March '66 Dearborn coupe. As the first one shows, the lid has a C4 part number so it was also used for earlier years. The second photo shows the two flat springs on the back side. The 'two' springs are actually formed from the same piece of metal. Notice that the top of the left side spring is making contact with a small cam. The third photo is a closeup of that 'cam' on the closing spring that keeps the lid closed and, as the photo illustrates, it can also keep the lid partially open. The right side spring helps keep the ashtray from easily coming out of the hole in the back of the console which explains why you need to fully open the lid to remove the ashtray.
Our other '66 has a new, repro ashtray which is basically the same except that its parts are not as well formed and the lid closing mechanism doesn't work very well. From outside the car it looks correct but sitting in the back seat you can tell its a repro even before you open the lid.