As you may guess from my username, I’m into Kenwood! I’m currently researching the glassware for their earliest machines. I know for certain that the 50s and early 60s glass bowls supplied with their mixing machines were made by Duroglass in Walthamstow (part of Webb’s Crystal Co), and that it was part of their Duroven range. This was chemically toughened glass, designed to withstand heat and all kinds of abuse! I even managed to track down one of the glass factory workers who informed me the main gatherer for the Kenwood bowls and liquidisers was called… Ken! (Kenwood was set up by a Ken). What I would like to know is if the same factory made the very earliest glass bowls for Kenwood in 1947-1950. These bowls are very rare (more so than the machines they came with), and are slightly different from their later counterparts. I’ve attached an image of a 1949 bowl (L) next to a 1961 bowl (R - confirmed Webb’s Duroven). As you can see, the older one is almost opalescent. It shines blue and orange with the light. The later one doesn’t, but is of similar thickness.
I found a listing for a lovely set of Duroven dishes on Etsy (search Duroven and they’ll pop up) which show similar iridescent properties in the photos, so it’s possible the same manufacturer was used in the early days and they just changed their mix over time. But I wonder if there are any other possibilities. I know Jobling did their version of Pyrex, but who else is likely? Any input appreciated.
It would have been an English manufacturer, by the way (bowl is marked Made in England).