In Antwerp cathedral on either side of the choir are two massive Rubens 
paintings, they are raised on plinths of red (rouge royal?) marble with 
grey marble banding. I don't know if these are contemporary with the 
paintings, but it struck me when I visited that they looked remarkably 
like a Ruckers case side. Here is a link: 
https://commons.wikimedia.org/wiki/File:Cathedral_of_our_Lady,_Antwerp,_Belgium_-_panoramio_(6).jpg 


and here is the spine of IC 1652 
http://www.mimo-international.com/media/CM/IMAGE/CMIM000027408.jpg

I don't know about iron, but I have never seen an original where the 
grey bands seem to imitate marble. They certainly want to give the 
impression of being raised above the marble with a dark shadow below the 
upper and a highlight on top of the lower. (note that the 1652 has been 
extended with an extra keyboard and hence the very right bit and the 
vertical frame would stem from the time of the ravalement. It's 
interesting to note that the spines keep their original marble (this one 
and the 1628 Ioannes at Versailles with very elaborate Claude 
Audran-style decoration on the other case sides, probably as proof of 
their pedigree)

Andreas Kilström


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