Good find with the casing.
CC is the correct manufacturers mark for your Roto.
This style CC tap covers most Model 4 standards, Most 3's and Model 5 Series 1-2.
Early versions of Roto 3 had the cigar, since they intersected with The last Automatics, but your Serial would indicate the CC tap is correct for yours.
KL was fitted to Series 3 and dep store models,(with the possibility of late Model 5 series 2).
Im unclear why the brand change, since CC continued to make most of Victas other castings ( mags carbs pulleys etc). until at least the end of the Sheerline series.
While I love B&W images in many categories, IMO, I find it detracts from the Mowers detail and character.
I wonder if you might do me a favour and measure the height of your base mounts for the Axle brackets on the Model 3 please. Also if they are smooth or have the checked pattern in the metal.
Cheers.
