According to
http://www.kurtkaminer.com/TH_raleigh_serials.html shows below
"System 1970:"
The first system consists of 7 digits, beginning with 1000000. This system showed its face in 1970 (I have named it accordingly), and was phased out in mid-1973.
EXCEPTIONS: Evidence indicates that a handful of '70-'71 frames - or their lugs, depending on when the stamping was done - may not have been released from the factory until 1973, and were consequently decaled as 1973 models. This is the only explanation I can suggest regarding this issue.
"System 1972:"
A second 5-6 digit serial system was introduced in 1972, overlapped onto some early 1973 models with NO rhyme or reason, and died a quick death before 1973 was out. This system never exeeded 6 digits, and the reason for its introduction remains a mystery. Regardless, it is here, and it will stay.
This system
INCLUDES the Grand Prix and Super Course, despite the seven-digit serials (as mentioned in the next system, below) running concurrently on these models.
An additional 7-digit serial system was used in 1973, appearing only on the Grand Prix (including Gazelle production), Super Course, and Grand Sports.
These serials are instantly recognizable, as the first digit is
always zero, and low-number serials (i.e., "9181") will have a prefix of as many zeros required to make the serial seven digits - in other words, "0009181" - such as the example Grand Sports shown above.
Keep in mind that this serial system - though used on these three models in 1973 - are not
unique to them during this year. Some examples may use one of the two systems listed above, or the later 1973+ variant.
Serial location:
Outside of left dropout.