Alfred Herberts' had an Indian based subsidiary which made the older Herbert machines for sale in India and the Asian sub-continent. It was overseen by AH employees who went out there to maintain standards and quality. My understanding of the operation, when I was an AH employee, was that it was considered to be a 'Jewel in the Crown' operation which produced high quality machines. I would expect that any machine made there, whether badged as Herbert, Holbrook, Edgwick, or Attritor (a unique pulveriser!), would be the equal of any made in the Edgwick works in Coventry.
Herberts had numerous subsidiaries based all around the world. From memory there were factories in Brazil, Australia, and India. Employee's were often seconded to these far away 'stations' to work for a number of years, I had a fellow ex-apprentice who was seconded to Brazil for a 3 year contract – he went 'native' whilst out there, married a Brazilian and never returned! Happy days!!
Martin