I have a 135mm f6.3 Wide Field Ektar, a 1948 model, with something extra. The serial number stars with an E followed by a space then EI 1207. Has anyone ever seen a three letter serial number? Does anyone know anything about it? I have never seen another Ektar with three numbers nor can I find a picture with three. I have searched the internet and still nothing. Any help would be greatly appreciated, it's just one of those things that will keep me awake at night!
Thanks
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