The lines on the fields are called die flow from an aging die. On 'ONE' there was an issue with a small amount of grease on those devices. They die was probably wiped down spread the grease into the die. No premium for this. Just part of the process. On a doubled die, the devices will appear larger. Very few doubled dies on the obverse size after 1970. Note on the listing from the CONECA site (Variety Vista)
http://www.varietyvista.com/07%20Ro...Listings.htmAll the listing with the black colored letters are showing no
DDO's these years.
On the reverse dies there are a few more
DDR's:
http://www.varietyvista.com/07%20Ro...Listings.htmWith so few after 1970, I feel they are a waste of time looking through them after that date.
Wexler list a few more. But they are pretty much very few if any found. (especially on the obverses)