Here we go with the 77's.
The original N77 was a 'pre DIN' binding.
This add shows the later N77
N77 Toe piece. Note the wings were all aluminum. Forward facing brake. 1-5 setting range, Pre DIN.
The N77 heel piece. Note it still uses the heel holder from the earlier bindings. 1-5 setting range. Pre DIN standard. Note there are no more rollers interfacing the boots rear lug. It is now the conventional full width hold down. Remember that the roller was designed to work with an applied astrigal piece that was placed on the leather boot heel.
This is a later N77 heel. It now has spring pressure holding the heel down against the ski. Note the rubber protector is missing on this example.
This takes us to the LOOK 77 binding.
LOOK 77 toe piece. Note we are now using the DIN standard for release adjustment (4-10). The toe wings now have the Delrin anti friction inserts. Same forward facing ski brake as the N77.
LOOK 77 heel piece. Updated for the new DIN standard release settings (4-10). Has the rubber protector where the heel is pushed against the ski when not in use.
There you have it. The entire LOOK 77's as I know it. If anyone is aware of other variants please let me know and post some pix! I have around twenty pairs of this binding system. My favorite is the 77R 2rd variant as shown in the ad above. I use them on a number of skis from the late 70's and into the mid 80's.