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if you have not done so already would think first order of business would be to check steerer diameter

there is a good possibility it may be the Chater-Lea 31/32" size

dropouts appear to be AGRATI forged (3D on outer face and flat in inner)

fork ends appear stamped

to find period correct high quality fittings individually could deflate wallet

would think it likely to have expressed an 8V drive train

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