Hi Trevor, you have a very nice "mint" widshield there. Is it possible that the lettering/numbering refers to a a part number rather than a Patent Number? Valor certainly used part numbers in the 4000-series It is difficult to see how Valor could convince a Patent office that a windshield design is new, inventive, useful and non-obvious. Best Regards, George.
Hi George Looking at the windshield again, you absolutely right. It says "PT No 4572" and not "PAT" Do you know if other British two-pint stoves came with this kind of windshield - is there a 'Monitor' and 'Thermidor', etc.??