Hi
This looks already similar to the T6963 displays, that i have seen before. All connections, which go to the Arduino, are already identified.
Pin 1 often is "Frame Ground".
The remaining problem will be to identify the contrast input pin. Often, this is pin 4 (e.g. see here:
http://www.noodlehed.com/ebay/datasheets/pg12864f.pdf).My suggestion is to do this:
Apply 0 and 5V to the two power pins, which are already identified. The NVI should now start to work and the -15V..-10V output should be visible somewhere (maybe pin 9 or 20). If this is the case, then it is very likely that pin 4 is the contrast input pin. The contrast input pin should go to some resistors and caps on the PCB. Once you have identified the contrast input pin, you can connect a variable resistor:
one end of the var res goes to 0V
other end of the var res goes to the NVI output
wiper must be connected to the contrast input.
Powering the display with 5V, you should be able to turn on and off all pixels by moving the wiper from one end to the other.
Warning: Choosing the wrong contrast input might destroy your display.
Oliver
Edit: Variable resistor value should be between 10K and 22K