I would try to apply power and see what happens. Ground to pin 1, and +5v to pin 2. Possibly you will see some indication on the screen, like where the cells are partially darker, maybe not. Also, see if the backlight becomes lit, as maybe it is not powered on separate pins? I also wonder if one of the pins is a contrast control, where a variable resistor to ground can be used to vary the contrast (a few Kohms).
I think that the hardest part will be to discover the SPI pins by experiment. And then, you have no idea about the command protocol; maybe it is the same as a normal HD44780 type display, or maybe not. I suspect there will be too much trouble required to make this display usable, but you will have to decide what to do. I don't think any one can help, without a data sheet.