Companies taped by GM all had their own design ideas,so there really wasn't one specific template.Some outdoor Chevrolet signs in the early to mid 1960s were ribbed,but not all were as ribbing wasn't a requirement by anyone.
Dealer showroom signage,both outdoor and indoor,was handled by GM Photographic.
Auto show signs were designed and made by the Chevrolet Show & Display group,for which outdoor durability wasn't usually a design factor.All signs were of course,subject to Chevrolet Sales Dept. approval.They had the final say.
Hanover Mfr. was also a sign company that GM used to make their indoor signs,clocks etc.Campbell-Ewald wasn't involved with any lighted signs,they only got involved with lengthy advertising copy such as descriptive paragraphs on displays that needed to be written.
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