Thanks for the comments all. I too would have liked to watch the meer color over time...
The fact that it's not the original stem becomes evident when you notice the extra space in the case below.
Although, it seems to be amber, or it looks like the amber I've seen for sale with bugs and whatnot trapped inside... milky fissures shown below, though perhaps I'm mistaken. Seems fragile as well with cracking throughout.
The tenon was apparently contact cemented in the stem as was clogged with it, so I'd imagine it hasn't been used since the 'repair'. You can see some crumbs still on there... it pretty much fell out of the stem.
The bowl is very caked as you can see. You might have to turn up the brightness, and I haven't touched it yet.
I think it's actually a silver band by the way the tarnish disappeared when a sliver polishing cloth was used.
And the shank is literally pencil thin.