Looking at older service stations and pumps pictures online, appears there were two primary shades of Shell Yellow paint.
Does anyone have a timeline of when they used the more mustard/darker yellow VS. brighter yellow shade?

More specifically, in the mid 50's did they us one vs the other or was it up to a station owner or Shell distributor in a given region?

Any info would be great and if you have an original painted Shell pump, be great to see a few photos including brand and year if known...