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I do not agree that the forks and stays are chromed.
Since I have the bike myselve I can tell it's really stainless. I also polished spots out the stays and forks, that I coulnd't polish out Chrome. It also says it's stainless in the Gazelle brochure:
https://drive.google.com/file/d/0B32pci5b781hY2JiZDNkMDMtNDBjNy00MGIyLTgwYWEtZjM3YTQ2MWI3YWEz/editThe brochure says: RVS, which is "Roest Vrij Staal", which translated to english is Stainless steel.
And second I also don't agree with the identical spec of 531 tubing. If it was only 531 tubing for the triangle for a 653 tubing, why would Gazelle put a Reynolds 653 sticker on it, when it has diffrent stays? Scroll down in this thread: http://www.bikeforums.net/classic-vintage/774565-how-much-flex-reynolds-653-forks.html to the constructors guide, you can see the 653 is very similar to 753 in gauge thickness. And not similar to 531.
EDIT - Stays not chromed (as I assumed) genuinely Stainless steel
Reynolds say:
"531 Main tubes drawn thinner than 531C; 725 rear stays (replaced 531P)"