I did find a few of the round Electrose strains in the radio and guy wire strain photo gallery but nothing about their value. I would also like to know what the all round black porcellian would be worth as well as the five inch black porcellian. Niether have any marking and I don't believe they are all that common. Do you know who made them and their value. They are both dark black with dark gray tones glaze and look like they came from same source. Any and all help would be aporeciated.