JetPens posted more photos of the TWSBI ECO "Bahama Yellow" and as I suspected, it's tan (first photo). A smidge lighter tint than their Caffè Bronze (second photo), and the silver trim makes it appear lighter still.

It's not a bad color, just badly named. Has to be for yellow sand beaches, not sure what else makes sense.

If I were going to go for one of these, I'd opt for the Caffè Bronze, but neither one really grabs me the way the 580ALR Affogato/Onyx did.

#FountainPens

@jimp it looks like dark mustard. I can like a good mustard yellow but this isn't it to me. I haven't been interested in new colourways for quite a while...

@silhelm Seems a bit more orange-y based brown than yellow-brown to me.

They have had quite a few lately that I didn't care for. But I like it when they make colors that don't appeal to me because it's less I'm tempted to buy! Thankfully I only liked one of the marbled mixes.

Still waiting on an actual Red one to come around again. Plum was good, but not quite close enough.