Centurion
 

http://i1141.photobucket.com/albums/...pszfpwoytq.jpgDid some research. With the knowledge base here though, your guess is better than mine. During which era was round headbadge? I'm guessing ealy 70s.
Cigarette butt for scale.

If that's a first gen cyclone RD and it's original to the bike (two bid 'ifs' with a picture of that quality), I'd say you're dating this bike about a decade early.

E: why not include the other image from the for sale listing??

http://i.imgur.com/f0nqc35.jpg

What does the other pic tell us?

That looks like my 1981 Centurion Super Elite. It also came with 1st gen Cyclone RD. I haven't been able to find a 1981 catalog online, but looking at the 1979 catalog, it doesn't seem like there was a whole lot of change in specs from 1979-1981.

Round headbadge is circa 1978-1983. This appears to be a Super Elite from the earlier portion of that range.

Edit: Given the period and level, the frame is most liekly manufactured bu Miki, in which case the serial number will tell of the exact year.

[MENTION=209428]seedsbelize[/MENTION],

the model name is on the drive side chain stay . Looks like Super something. Super LeMans or Super Elite.

The pin striping I believe is from the 1980 and 1981 model years, but I am not certain about that.

Thanks. I was looking on the top tube and saw nothing. I could have spent days looking and never see that.

Would it ride much different than my 87 Prelude, with Tange tubing?

My '80 Elite had that badge.

It will be more relaxed, and like straight lines better, so you can pay less attention. Those take a bit more effort to get out of line.