Guys......during the 40's printing ads in color was VERY expensive and used what was called 'Process color'. This used only a few simple colors like red, blue and yellow and could only create very limited variations of color. That specific ad looks to be made of only two colors, red and black, and there are no browns......that's just the aging of the paper. So if you're thinking the colors in that ad are accurate...........you might want to rethink that. All you can tell from that ad is that the strap wasn't red. Other than that all bets are off. You really need a better reference to know what color that strap was. Just sayin'.
;O)