The first generation Delica is the only one with a molded FRN clip, although there are a number of variations within that generation. I recall Sal Glesser posting that the Delica and Endura molds went through five changes before the switch to a metal clip. For the record, molded FRN clip is first generation, stainless handle with two position clip is second generation, FRN handle with barrel bolt steel clip is third generation and the current fourth generation has a four-way three screw clip. There are many other differences, but those are the easiest way to tell them apart.