The signal def doesn't go both ways. The only 7pin cable sony offered that did both digi in and digi out was their 7pin optical cable. For their 7pin>coax cables, they made both digi in cables, and digi out cables. I'm not sure if there is anyway to tell by looking at it, but I'm almost sure you wouldn't be able to tell from this picture.
The 7pin coax digi in/out cables were all aftermarket cables, not ones directly offered by sony. Usually made by either Oade bros. or Prodigital, though sold through different retailers (oades, sonic sense, american digital, etc.).
Whichever it is -- digi in or digi out -- it will be the same no matter what sony DAT deck you're using. Is this your cable originally? If so, do you remember if you used it for digi in (eg, from a portable A/D in the field for recording) or for digi-out (eg. for digital playback out of your D8/M1 to your digital soundcard for transfers)?