RHEIN MAIN KIES UND SPLITT GMBH & CO. K.G.
image by Eugene Ipavec, 17 April 2009
The blue flag bears large white sans-serif initials RMKS. The image follows a table flag offered on German eBay; the website also shows a flag-like logo. Jan Mertens treated it as a possible house flag and had found no photographs of it flown on vessels.