Help identifying Weyless Hubs

[merlin3008]

I'm posting to find a little more information on these hubs. I friend of mine just came into three pairs of these Weyless hubs - new in box. From what I've learend so far, they appear to be from 1975-1978 and seem to be one of the frist hubs to use sealed cartridge bearings. Ultimately he would like to sell them so information on value would be great.

Thanks!!