As Peter Jourdain pointed out, there is simply no comparison between the Hetchins frame being outed to the List by, Chales Andrews,and the Hetchins Mixte that was recently sold on UK E bay.
The simplest explanation is that the latter, with its expertly adapted Super Champion Oscar Egg lugwork is a genuine Hetchins, probably made in Seven Sisters Road, and the other is a staightforward factory-made generic mixte frame, whose lugwork owes nothing to ingenuity or individual skill, nor to Super Hampion nor Nervex.
I have several frames that.,without the Hetchins transfer, resemble the Hetchins Mixte (Uk Ebay model). They were available in the late 1970s from firms such as Holdsworth, Claud Butler, Falcon, Crown cycles , Viking etc etc.
Most of the frames had the cheaper semi-decorative Bocama lugwork, Wagner crown and cheaper forged drop-outs. Tubing sets varied from Mazucatto high carbon steel through to Reynolds 531 PG, via Ishiwata O245. For little under £10 per frame Reynolds 531 D could be bought as an extra. Standard paint finish was a single colour finish in a selection of flms and metallics rom the well-known IVIS and COLVER ranges.
As somone mentioned on theList some months ago, companies such as Alx Singer would buy in cheaper ranges of bikes from outside contractors and trnsfer them up...sodid Hetchins probably.