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EKCO was a British brand of televisions manufactured by Eric Kirkham Cole Limited
Most of Ekco's Ovenex baking pans were made starting in 1945. They were manufactured for a 20 year period. Ovenex baking pans have stood the test of time and are still used today. The Ekco company was started in 1903 and first made military boxes. The mess kit first issued to World War I military personnel was made by Ekco.
I have the zPrudence China-Baronesse 328, which has a silver trim. No it is not microwaveable, if it has any kind of metal (that I know for sure). Yes, Prudence China is made exclusively for Ekco Home Products Company. They however do not appear to be on the internet. Replacements Ltd does have some Prudence China. They are currently out of stock on the Milancia 327 which is what I have and our butter dish got broken in the move. So if you know anyone who has a butter dish in excellent condition for the Prudence Milancia 327 line I would be interested in purchasing.