The top one is also a Joh Engstrom. It would have had a bail originally and I will make another for it if the mood takes me one day, the middle one is made to take a ring as well, but I just have not made one yet... slack really, but it is off getting engraved with my makers name, serial number and year of manufacture. I like the idea of putting a year on them, hiopefully someone 100 years from now will be showing it and saying, "look at this lovely knife made 100 years ago.." Joh put a date on his, but it was the date of patent and thus useless (1874) He made barrel knives through to around 1915 so all I can say for sure about mine (and your grandfathers) is that it is 100 years old or older.
Yes, on the other side are a large arrow to remind you which way to put it back in, the initials JE and the same patent number.
IIRC, he got it as a young man and carried it nearly his whole life. I figured it had to be about that old.
You should get a Knifemaker membership here. I'm sure you'd have no problem selling these lovely pieces.
Sterling Silver ferrules and Damascus....... tastefully done as you have, just make everyone drool.

