(Original?) Vintage Date 1601 WITHOUT "Superlative" on "Officially Cert. Chrono."?

[lazypolarbears]

Hey guys,

It's been a while since I've been on here... I recently bought a nice vintage Rolex but I've never seen a Rolex (caseback dates to Q1 1960) without "Superlative" in the two lines "(Superlative) Officially Certified Chronometer".

Was this intended or was it repainted for whatever reason? I know sometimes small things matter (e.g. "underline dials") and was wondering what this exactly meant... if anything?

Calibre 1560... Butterfly roter. Pics attached; I don't have the MPN but assuming 15xx or 6xxx.

Thanks!!