I am confused when searching for a user's manual for Nokia5110 LCD. I've found User manual ET LCD5110 with This has the same pins with different placement; therefore I don't know whether I have found the relevant user's manual. My own LCD is the following:
For what it's worth:
in this link: https://www.bluetin.io/displays/nokia-5110-display-raspberry-pi-guide/ the same display as you is being used.
At the end, there is in Buying Featured Items - Adafruit a link added (named Nokia 5110/3310 monochrome LCD + extras), the link is:
This link shows a different pin-assigned board, but it seems functionally similar (at least you can check both pages).