With the big frame tubes I'd say it's ~1998 or later, probably ~2000. Somewhere on it there is probably a Pacific Cycles, or made in China, sticker (2000+)...if not, it probably says assembled in USA. If it says assembled, probably '98 or '99.
I have a '63 1/2 Ford Galaxie that has a quadraphonic amplifier behind the backseat and I can see where the optional phonograph used to be installed under the dash. A real rocking machine in '63!
I forgot about the circle SE...it does appear that they started ~'59. I think it is a '58 model year built at the end of '57.
1959 Rollfast catalog...
...you can clearly see the cantilever tubes attach to the 1pc seat stay loop. This feature was retained in subsequent years.
1958 Rollfast...