Perhaps: Into what cog , and will it stay there under max effort uphill or at all?
Pre-Index shifting is a footnote for Classic hardware enthusiasts. I use mine today, it's clunky still and slow by comparison by >1984 tech.

Pre-Shimano indexing in the mid-80's selecting the gear for contesting a sprint was by feel, which despite the assumptions of those who never did it "back when" shoulder to shoulder in competition the much improved by SIS certainty of gear engagement was quick, effortless and crucial.

All other Mfgs tried to follow: Campag w/ miserable results and Sun Tour.

-Bandera