Why logos are going retro

Historical logos can work to associate these brands with nostalgia, experience and expertise that set them apart from younger start-up competitors. Alongside this trend is the increasing favour of authentic handcrafted logo designs from the 1960s and 70s. In a world where consumers are awash with digitally produced logos, this is a refreshing counter-trend.
--
"I wouldn't say it's about nostalgia. Rather, it's a return to a company's foundation and roots, showing a commitment to mission," she says. "If the foundation is strong, and/or has a valuable legacy, use it."
--
This year Kodak brought back its first official symbol designed by Peter J. Oestreich in 1971.

Working parallel to the emerging trend of old logos is a trend of logo simplicity.
Recent re-brands of major companies such as Deliveroo, Subway, Instagram and Mastercard have seen a replacement of skeuomorphism with vector-based logos.
http://www.digitalartsonline.co.uk/features/graphic-design/why-logos-are-going-retro-update/