The one in the brown sheath is a Model 1-7, possibly a 1-8. Hard to tell as there isn’t anything to scale it to. They have both been heavily used, the Model 1 showing the most evidence of sharpening. The dive knife is a Model 16, it is a stainless blade as witnessed by the “S” character stamped next to the hilt.
Timeline of the 60’s looks about right due to the spacer configuration on the Model 1- those more knowledgeable than I can tell more from the sheaths and stones.
Stop storing them in the sheaths- that is causing the green corrosion. To clean them don’t do anything more than wiping them down with an oily rag. Oil the blades then wrap the entire knife in butcher paper or similar (not in plastic).
The name & Smithsonian engravings don’t enhance the value IMO, possibly they would to the right collector in that specific niche’.