Hans,
there is on Photpicnet of Ujung Galuh a keris with Pamor : Dwi Warna (Adeg & Pandan Iris)
http://gallerykeris.fotopic.net/c1623160.html ..it nothing like this. I personaly think it is a Buntel Mayat..(Buntel Mayit is wrong name, as for as i know it). A pamor wel used on Bali keris, but there is a diffent name for it on bali.. unlucky i cant remember it.