[CR]Bolt-on derailleur hangers?

Hi list,

On some quite nice-looking bikes from early 60-ies, such as on this Hetchins for example:

http://www.classicrendezvous.com/British_isles/Hetchins/Hetch_db_VM.htm

there is a cable stop for the rear derailleur, but no derailleur hanger. Why is this, was it the norm then (but I think I also saw bikes from the same era that did have hangers) or was there a specific reason? Were all derailleurs then available with optional bolt-on hangers, or only specific models?

Thanks.

--
Cheers,
Dmitry Yaitskov,
Toronto, Canada.