This is a standard 2 lines by 40 charcaters LCD display, ST7066 controler (HD44780 compatible), with backlight. Backlight: yellow/green, 420 mA at 4.2 Volt (1.8 Ω series resistor for 5 Volt).
This display needs a negative contrast voltage, I got good results with -2.6V.
The datasheet link seems to be for a compareable but not exactly the same LCD, and is a bit confusing. It advises a contrast voltage of -0.3V, which is in my experience not enough, suggests that the interface is 8 bit only (4 bit works fine) and states in one place that there is no background lighting (which is definitely present).
This is a surplus product. It was obtained from a surplus store, from an inventory or from any other secondary source. You can expect this product to be in good working condition, but it can show signs of being handled, shipped, repackaged etc. The supply of a surplus article can suddenly run out, or the price can change. Get it while it is available.