Can't see the pictures - says "URL link expired". What does the stamp read?
The 1605/1606/1607 models were made between 1981 and 1998. The original retail prices were $17.20 $21.30 and $24.60.
The handle material was "black composition", so some kind of plastic. They were made in Hong Kong during the Cole National period.
The time frame is broken into 3 periods - the Cole National period (1966-1982) or the American Consumer Products period (1982 - 1996) or the ALCAS/CUTCO periods (1996 to present).
If it is CN, it will have CLEVELAND OHIO in the stamp. If ACP, it will have SOLON OHIO in the stamp. If ALCAS/CUTCO, it will have OLEAN NY in the stamp. I don't remember if I have ever seen one of these models with an ACP or A/C stamp.