The 22087 pattern has been around since at least pre-1940 ('Tested' era), according to one collecting guide* I have, and has continued on through the 'XX' era (1940-'65), the 'USA' era (1965-'69), the 'dots' era (1970s) and the 'lightning S dots' era (1980s), at least. The guide doesn't list anything later than that. The black synthetic covers were called 'black composition', according to the guide.
* - 'The Official Price Guide to Collector Knives', by C. Houston Price (2004)