Hi TurbofanDude!

1. The one on your picture looks retro-fitted. But it also might be, that the 100-series had the flat AH. As you can see on the following pictures, most of the 300-series had balls:  ;D
http://www.airliners.net/photo/Pan-American-World/Boeing-707-321/1661147/L/
http://www.airliners.net/photo/Sabena/Boeing-707-329/1555432/L/

The equipment could also depend on how they were ordered by the airlines, e.g. this one has the fire-extinguisher-handles on the overhead-panel instead on the glareshield:
http://www.airliners.net/photo/CAAC/Boeing-707-321B/1194697/L/

2. What do you mean with "dual"? The flight-director? If yes, I think most of the 707 had dual-cue flight-directors.
Or if you mean INS, that depends on how they were delivered and or retro-fitted. Some had none, some had one, some two, or even three. There are also some with GPS today.

3. The 727's had both types, depending how they were ordered:
http://www.airliners.net/photo/Varig-Log/Boeing-727-2A1-Adv(F)/1280433/L/
http://www.airliners.net/photo/Iran-Air/Boeing-727-286-Adv/1528492/L/

Some even were retro-fitted with glass-style displays.  ;) And for the INS, like the 707, some had none, one or two.


Greetings TheFinn