1977 "Light blue canopy"
The distinguishing features of this version include a filled-in nostrils on the bat nose, taillights that are also completely filled in, whizzwheels (12 spokes & notch tyres), a non-moving exhaust flame, the tail fin tips were shorter than on earlier versions and the Batmobile label on the underside of the car was revised to include a copyright stamp for National Periodical Publications.
This version is similar to the 1973 version but differs in a few ways. The 1976 whizzwheel version featured a different tyre tread and different style hub than the 1973 version. Also, the windshield was more light blue as opposed to aqua. The lower body molding differed from earlier versions with replacement of the word "Batmobile" with a rectangular copyright molding that says "Batmobile" and "National Periodicals Publications, Inc." near the turbine exhaust. For the Batmobile collector, I think you should have either a 1973 version or a 1976 version to round out your collection.
1976-79 Corgi Batmobile - now made with 12 spoke whizzwheels, Robin very small, no instruction envelope, available in blue, white and purple glass. The other main change was to the bottom of the Batmobile, which now had National Periodicals on the bottom. All versions before this just had Batmobile on the bottom. There are versions of this car that had Batmobile on the bottom, and they happened with the white and purple glass. Which were the first to have the new styled wheels... When the blue glass later followed, it had National Periodical on it.
From 1976 though, no instructions or badge were included with the car, you had to make do with a diagram on the back of the box instead!!! Cost cutting by Corgi!!
1976 window style box. The backside of this box showed a photo of the actual Corgi Batmobile. By this time, Corgi apparently decided it was too expensive to include the instruction envelope, etc. So the instructions were printed on the box. It included a sprue of 12 yellow missiles.