i was hoping someone out there could help me with some dates. i have several polished pilot survival knives, and possibly an astronaut jet knife. when did camillus switch from the brown and tan two piece box to the current thin red cardboard one? and, when did they stop the date stamp on the pommel? the tangs are stamped: (each on is different) "camillus ny" no pommel stamp, "camillus new york" (looks like new ones) no pommel stamp, 1-81 pommel stamp no tang stamp. any idea when these were made, years, etc. and how to determine value. i have orig boxes, papers, etc. thanks!