NOTE: THE COLORED TEXT SEEN ON THESE PHOTOS IS NOT ACTUALLY ON WHAT YOU ARE BUYING.
From Jane's All the World's Planes, 1940 edition, here is an ad for Hadfields Steels of Sheffield. At the top of the page Serck Radiators are featured as well. The reverse page is boring and not worth scanning, trust me.
This ad was carefully sliced out of the book and measures 7 1/2" wide by 12 1/2" tall. It will be mailed flat in a manila envelope. I can ship many of these ads for the one base shipping rate but you must wait for me to send you and invoice otherwise eBay just keeps stacking the shipping fees on.
Thanks for looking in at one of my auctions and best of luck.
The Mighty Atom.