ABU 5000C, another earliest

This is another very early ABU 5000C. The grid (checker) on the left spool cap is a little deeply engraved, which is different from those of later ones. Unfortunately, the flame of this reel is without a foot number (maybe the former owner replaced it as soon as he/she bought it), but judging from the parts it must be one of the earliest 5000Cs.

ABU black Ambassadeur, engraved as 5000

Who can recognize the earliest ABU Ambassadeur 5000C, if it is not marked as 5000C? This reel is very precious to me.

ABU 5000C, misc

I have a nice decal of Ambassadeur 5000C. Judging from the parts of the picture, the reel painted on this decal must be one made in 1972 or in an earlier year.I also have a beautiful relief (display board) of 5000C. It is mint and has not even been pulled out from the plastic bag. The reel on it may be one of 1974 or later models (The logo design of Ambassadeur is the same as that of one of the reels).

ABU 5000C, 1977 model

The 1977 models look very similar to 1976 models.

ABU 5000C, 1976 model

In 1976, the spool cap was simplified. The bottom skirt of it was removed, and a dial indicator is made on the surface to adjust the brake correctly.The level winder was also changed. Some dash lines were engraved on the front surface.
Mine is #761104, as you can see.

ABU 5000C, 1975 model

I found no differences between 1974 and 1975 models. My #750603 looks the same as one of the 1974 model.

ABU 5000C, 1974 model

The engraved logos on the left side were changed in the early 1974. The positions of Ambassadeur and ABU logos were replaced with each other, and the font of Ambassadeur was also changed.
The front surface of the level winder looks flatly cut, while older ones have a semi-spherical one.