If you do Internet searches for the first-generation cisco routers (AGS, AGS+, MGS, CGS), you're going to encounter one teary tale after another about people who had them, threw them out, and have regretted it ever since.  You'll also find the folks who are in full-celebration mode after finding one after years of searching.  These are important historical pieces, and the demand is only going to increase - as will prices.

I've opened a long-stored cache of (a few of) these routers, along with some spares, and it's time to put them up for sale.

This is a FDDI board for an AGS+ router - it won't work with any of the other models because that's the only one featuring the Cbus (aka ciscoBus).

As always, I'm happy to answer any questions I can, as well as to combine shipping if you're buying multiple boards.