A Chubby 1 (CH1) in Best from the personal collection of David Carter.
The handle is definitely that old, pinkish rod stock, and you'll notice this more contrastingly in the second photo. The lathing is better than the above CH3, IMO, and I'm going to date this CH1 a bit earlier than that one too, let's say very early 1990. The lamp-black stamping is finer than the above CH3. Dimensions:
Knot: 24.5mm
Loft: 51mm
Handle Height: 40mm
Total Height: 91mm
Compare those measurements with today's "Vulfix" model:
Knot: 22mm
Loft: 46mm
Handle Height: 39mm
Total Height: 85mm
In the photo below, you will see a "later" Carter-era CH1(in Super) on the right, and the differences are obvious, including that surface-level lamp-black, which looks more like it has been stencilled on rather than stamped in. Lathing and shape is different, too. Underneath the immediately below photo, I have added a close-up of the lathing circles on the underside of the rosy-pink "early" Cater-era or transition brush.
Underside lathing of the pinkie:
Below: underside, typical lathing of the "later" or more commonly-seen Carter-era brushes: