Possibly we should look at the basic elements in this dress ; the gambar has an extremely pronounced mid-rib which is an element I have not seen on Maduran gambars .
The scabbard carving is representative of simple form and extreme *repetition* ; another element that I have not seen on Maduran work . The extreme width of the gambar doesn't seem in keeping with Madurese work either nor does the shape .
Your humble moderator would deeply appreciate some postings of Cirebon kerises so that he might compare forms .
Perhaps the example in Frey III and Naga Sasra's keris are simply anomalies but that answer really doesn't satisfy .
Rick