I spoke with Barry just now and he told me:
In the 1950s at the factory in Vine Street, Charatans would machine-turn one gross of one shape per week, say the largest billiard group 4, this would be turned with a small tobacco hole (group 1). These bowls would be inspected and the ones with flaws on the bowl or shank would be re-turned to a size 3. These were inspected and the ones with flaws were once again re-turned to a size 2. The group 4 ones which were clean were then placed in a pre-set chuck and the tobacco holes opened up the extra 2mm and so on. This is called 'solid turning' in order to maximise the yield. If these bowls had some small spots they were sandblasted. The fallings, (some people call them failings)were sold to other pipe companies as C-D bowls (the best being kept for Charatan, namely A-B bowls). So the production of catalogue-shape pipes was 144 per week although some were sold off as C-D bowls. In 1964 The factory took over the old Philip Morris factory in Prescott Street, a few hundred yards away, where they continued this production of 1 gross a week. Then in 1967, the factory moved again to Mansell Street, a few hundred yards from both other factories. When my father joined the company in that year, Barry suggested to my father that they turn half a gross each of 2 shapes so that more shapes would be coming through as the shape chart broadened. After this, production markedly increased as the demand for Charatans grew stronger.