Tim got me thinking..... I took a look at the rear letters on my original 77. The roller would have to be at least 2.5 inches to cover a letter in one pass. They look like they only got one coat and I don't see any edge marks. Makes me think it was at least a 3 inch roller.
Rolling metal with hard rubber is hard to do without sliding sometimes. My letters have a consistent slightly dimpled pattern. I am wondering if it was a hard rubber felt covered roller. Seems like it would need to hold paint and also get traction on the metal.
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I think this is Wimbledon white.