700 is the base model, Identified by trade name being Roll stamped as "Webley & Scott" on top of Right Barrel Hand tube,"Birmingham England" on LH tube, "Webley & Scott" Roll Stamped on action sides.
The next Grade 702 was a 700 with better wood.
The 701 which is the top grade had Webley & Scott Birmingham ,England. engraved along rib or Barrel if fitted with Churchill Rib.
Often with drop points, some beading to fences,Gold inlaid "SAFE"on top tang. Shoulders on fore end wood.
Minor variances included models listed as 712,720,728 denoting gauge were marketed to the US market