These Hardy brass face Perfects are manufactured within a short period of time and with the automation employed by Hardy's in the early 20th Century, you would expect that autonomy would exist in the production process.
These examples both measure 4" 1/2 in diameter and the first obvious difference is the example on the right has a patented 1903 line guard. The example on the left also bears all of Hardy's logos on the faceplate being the straight-line, oval and rod in hand.
These rim mounted tension adjusters vary as well and notice how the rims are finished.
As ever, when collecting these reels, condition is key with better examples capturing a premium and sometimes selling for several thousand pounds.