Hi, just picked up a frame today said to be an early Ernie Clements but it looks more like a Black Diamond by the lugwork and tops of the seat stays. All previous marks removed by previous owner in stripping down a terrible paint job. That may have been how it could have been miss represented when he got it.
Looking over t'internet seems that the Black Diamonds came in many forms over many years the only marking on mine is the number stamped into the BB. M9K25712. It's really neatly done so suspect may not be a frame number. Save for mudguard eyes there are no brazed fittings. It has come with a nasty plastic Selle Royal saddle, Sugino double square taper chain set and Japanese alloy quill stem marked with 79J in small depressed circle towards the bottom.
Sorry haven't figured out how to post any pictures yet but lugs nice and sharp but are only scolloped on the head and front of top of the seat tube.
Any clues or confirmation of what it may be?
Thanks