I replaced this Dura Ace 7300 AX derailleur on my 1983 Univega Super Strada with a fist generation Suntour Superbe.
It worked ok but I just couldn't get used to the in derailleur index system it employed. So should I keep it just so I have
everything original to the bike in case I sell it even though I'll probably never use it or try and sell it? You can see by
the photos that it is in great shape. Any idea of how much to ask for it if I sell it?

No idea on value but they aren't making them anymore so I'd expect value to increase in future and yes having it in nice condition like that might really impress a buyer when reinstalled.

We should really get a "what's it worth & appraisals" subforum around here.

If they're not posted there, the answer is always $3.50.

"Now don't go offerin' the soul no tree-fiddy, woman!"

I never liked them. To the co-op.

Actually the post was more of asking advice on whether to keep or sell.

I had to google this one because I have never seen one.....do you really need the money and that is the only thing that you want to part with.....I would keep it and eat fried bologna for a few weeks....
Best, Ben

I think you're right. I don't think there would be much of a demand for it.