As I am taking the bike apart for the winter overhaul I noticed something that I never paid attention to before, it seems it's orange underneath the yellow and green paintjob. When I first noticed that a while ago I always presumed it to be orange anti-rust undercoat as I know it from my childhood but a closer look reveals it's too shiny. I never questioned the yellow being a paint job because it looks pretty legit but now I understand why it never shined the way a proper coat should. I couldn't find any serial numbers but I took some more detail pics for the bike sherlocks here.