Old Parr bottles do not contain serial number like some others do.
For dating your bottle, here is a list of important areas to photograph:
1) Front - "Front Label" & "Shoulder Label" (Between neck & body area)
2) Side - Full bottle view (at least one side)
3) Top & Bottom views
1) Front & Side (Can be done in one photo @ 45-degree angle)
2) Back & Side (Can be done the same way as above)
Walter C Hurst