It isn't a roller bearing, but the Chris King meets your other requirements. It's certainly period correct, since they've been made since the late 70s. The bearings are as tough as roller types but they are much less stiff. And while King doesn't like to promote the fact, they are available without the logo.
Peter Jon White
Peter White Cycles
24 Hall Rd.
Hillsborough, NH 03244
603 478 0900 Phone
603 478 0902 Phax
http://www.PeterWhiteCycles.com
> Does/did any manufacturer make a headset with the following:
>
> English threading
> 1970's style similar to a Campagnolo NR/SR
> Sealed to prevent crud reaching the bearings
> Tapered roller bearings
> Alloy with steel race inserts
>
> If so, anyone have one for sale in NOS or mint used condition?
>
> Most important to me is the English threading, followed by sealed from
crud,
> then style, then tapered roller bearings, then alloy.
>
> Recomendations appreciated.
>
> Thanks in advance,
>
> Eric Elman
> Somers, CT