Came across below here (bottom of page)

Crank: NR Double '77 - '87
Cup threading & width: BSC 68mm
Spindle length: 114.5
Cup type: Thick

NR Double '67 - '77 -Thick Cup
PRE - '78 GS/Record - Thin Cup
Threading & Width: BSC 68mm
Spindle length: 112

Use of pre-78 cranks on post-77 spindles will result in cranks sitting 1.0 (LH) and 1.5 (RH) millimeters too far outboard. If crank arm tapers are well used, this may actually not be bad.

Use of pre-78 spindles on post-77 cranks will usually result in the inner chainring or right crank arm hitting the right chainstay - not acceptable at all!

From 1958 - 1972 Record crank arms were not dated on their backs
From 1973 - 1979 the year of crank manufacture is the last digit in a diamond
From 1980 - 1984 the year of crank manufacture is the last digit in a circle
"11" in a rectangle means 1985, "2x" means 1986, and "3x" means 1987. The second digit supposedly represents the quarter of the year during which the arm was made.

Bianchigirl: what is CPSC...?