Was there a DIN standard back then? My 1977 WC M4s had 1 - 4 with 4 being in the 'gold' range. I think the toe is set at 10.
Seriously, though, when did indemnification begin? As my 1977 bindings were clearly not DIN; I wasn't racing downhill on a DIN of 4 ;o), are these DIN or just an effort to make the bindings look 'stronger' ala Spinal Tap amps that go to 11!
I guess Salomon couldn't afford enough space for their ad so the artist had to take artistic license to make the bindings (aka the product) fit on the page despite the skier (aka not the product) having a wide stance, etc. It also looks like in their frugalness, they gave him only one binding, not a pair, as the toe lift and binding tension screws are in an identical position. Not likely. Now when I put switch and outlet plates on the wall, I always line up the screw heads, but that's just style.
I believe 78 was the first year for DIN. The 727 came out in 77 and the first year ones were 1-4, then the second year they went to DIN. Or was it 78 and 79, it is blurry.