I picked this one up today. It was advertised as a 1972 Grand Record, and that seems to be consistent with the information in this thread.
The serial number on the outside of the left dropout is 1238406.
Assuming sequential numbering, that would place it somewhere just ahead of the yellow 1972 Grand Record shared by [MENTION=158148]VonCarlos[/MENTION] in
post 32 (s/n 1250892). Mine has the same paint scheme as the GR shared by [MENTION=41131]noobinsf[/MENTION] in
post 59 (s/n 1263931).
I would also note that though noobinsf believed his to be a '72 he has a different Reynolds decal than VonCarlos. The latest H Lloyd Cycles timeline says this decal change happened in 1973, though there obviously could have been a transitional period.
The number stamped on the inside of my right dropout is 64216.
I would note that this is the exact same number stamped in the same location on noobinsf's Grand Record and the Grand Record shared by [MENTION=243294]acoffin[/MENTION] in
post 18 (s/n 1428239) which also has the same color scheme as mine, so that number must have something to do with the manufacturing process and not the specific frame.
The bike shared by acoffin has a different head badge, and it has Weinmann brakes, which according to the catalog scans at bulgier.net would likely place it as a 1973 or 1974 (the scans list Universal brakes for 1970-1972).