1 Dating a Hase Kettweisel by the Serial Number Oct 10th 2011, 6:25pm The Serial Number of my Kettweisel is F06-05076. Can anyone tell me what year it is? It looks to new to be an 2006. Rumor is that it is a grey 2008 aluminum frame. The post was edited 2 times, last by Bluecoyote (Oct 10th 2011, 11:31pm).