The Limited Anniversary Edition for the 75th anniversary is recognisable by clip and cap ring of red gold and an individual numbering 'xy/75' on the barrel; all anniversary writing instruments of metal also have a grain or thread guilloché. A smooth, non-guilloché metal surface excludes an Anniversary Edition and points rather to the Royal Steel model. This has 36 brilliants on the cap ring and 19 on the clip ring (model number M10264). A clear identification requires a high-resolution sharp photo; for detailed model comparisons the model overview on fountainpen.de is recommended.