Nostalgia aside vintage razors for the most part IMO are made of better quality material(solid brass vs. zamack) and in many cases better workmanship(American craftsmanship from 30+ years ago vs. currant Chinese manufacture techniques). As far as engineering and design goes nothing made today with a "VERY" few exceptions, functions any differently from the way it functioned originally.
Pretty much any modern razor(TTO,2/3 piece, Solid Bar, CC or OC) you buy today is a clone of a razor from way back when with few exceptions. While modern razors such as Edwin Jagger, Muhle, Merkur, Maggard, Fatip, Cadet, Sabi, and Parker do offer reasonable and in some cases very good quality safety razors at affordable prices, they are still not quite as well made as vintage safety razors.
IMO to approach the quality(material, craftsmanship and durability) of a vintage "ALL" brass Gillette, Star, Gem, ER, MMOC, etc. razor currently you would need IMO to get an "ALL" stainless steel safety razor from a manufacturer like Weber, ATT, Tradere, Feather, Pils or iKon.
My favorite safety razors are a Weber SS DLC 3 piece, Gillette "NEW" Long Comb OC, Cadet OC and an ER1924 SE.

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