I'm honestly not 100% what the market value is for the lower denominated tokens. As I mentioned earlier, I'm open to any offers or suggestions for that matter! lol
I would recommend doing an auction to determine the market value. Start it at 0 or face value and see where it goes from there.
A friend told me 0.7 wouldn't be far fetched, but it does seem high from what I've seen. The markup was more off of the tokens current condition. I would be comfortable letting it go for 0.5BTC range