Here are some comparison photos between the OEM belt material (1973) and a new belt roll https://pbase.com/9146gt/image/161720894. Remarkably closed.

Also included are a few comparison photos of the font charecteristics and overall size differences between both, the 1973 OEM REPA label tag https://pbase.com/image/161720854 vs. the 1970 'OEM' REPA label tag https://pbase.com/9146gt/image/161757824 as well as a current 'reproduction' of the REPA label tag https://pbase.com/image/161720907

1968-1970/71 REPA "OEM" Label Tag vs. 1973 REPA "OEM" Label Tag https://pbase.com/9146gt/image/161757980. Very, very close, but there are some differences one can detect upon a close inspection.

1968-1970/71 REPA "Repro" Label Tag vs. 1973 REPA "OEM" Label Tag https://pbase.com/9146gt/image/161725209. Very obvious differences when compariing these two. Keep in mind the year of production differences and one being a reproduction. That said, the differences between both the 1970 and 1973 OEM REPA labels in negligent by comparison. Here it is again https://pbase.com/9146gt/image/161757980

More research to follow...