Hondo6

I did some additional looking re: Raleigh serial numbers. According to this source, Raleigh used a one-digit year code starting circa 1973.

During that era, as you noted Raleigh serial numbers were of the form CC######, where C=character and #=numeral. As you noted, the first character was the location where produced. However, according to the linked source the second character was a month code; the third character was the year. The decade of manufacture was to be understood/inferred; the number 0-9 was the last digit of the year. The remaining numbers were the unit's production run number.

In your case, the serial number is RG585192. As you noted, "R" in the first position denotes Canadian production. However, the second character "G" denotes manufacture during May. (Some - but not all - months used more than one letter. Yeah, that doesn't make sense to me either.) The first numeral, "5", is the last digit of the year of production. The remaining digits indicate your frame was the 85,192nd produced during that production run.

If the source linked aboveis correct, that means your frame is either from 1975 or 1985. If it's from 1975, the Shimano 600 components on the bike are definitely not original. They weren't made until years later.

However, if your frame was made in 1985, they could well be original. The RD appears to be a long-cage 6207, which Velobase says was produced from 1984-1986. Plus, the shifters, FD, and front crank also appear to be 6200-series and are thus also consistent with being original to a 1985 frame. The Biopace chainrings are also consistent with the mid-1980s.