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@Rik_Van_Looy
I've been a little mystified by this one, I must admit. I've never seen a frame with a grease port (common up until the 50's) with a seat clamp (not particularly common until the 90's)... The lugless construction is interesting too and helps narrrow it down.
Claud Butler is a good shout, but I think you also should look at Holdsworth who produced a model known as the LA QUELDA - lugless construction with a seat clamp.