"I've never seen a tri-color before
They are definitely getting added to my wantlist for the collection"
Get ready to spend some money. Nice ones aren't cheap. And often,, the box can cost more than the gun. So,, if you collect,,, be fore-warned. (A box with the wreath colored green is the rarest one. You will pay BIG bucks for one of those boxes.
BTW; In the Lightweight types of guns,, there are variations. The Tri-Color,, (as shown,) model LWAC, that has the alloy cylinder frame, the steel barrel, and the different colored alloy cylinder. Then, there's the LWSC that looks all blue/black & has a steel cylinder. And the all blue, alloy cylinder model. Throw in the flat loading gates & the ones with the round loading gate. Or the ejector rod button differences.
Collecting the Lightweights can be a deep & expensive rabbit hole. The Tri-Color is the most obvious one. Easily spotted. And for a bit more info,, due to the process of coloring the Tri-Color's back then,, the cylinders will almost always have nicks in the flutes. Ones w/o nicks are rare.
Over the years,, I've snagged a few Lightweights. My best score was an all blue alloy one. I spotted it on a gun show table on a Friday night after I'd gotten set up. The cylinder has a slightly different color of "blue" as a normal Single-Six. I was able to buy it for $350.00,, because the seller didn't know what a Lightweight was.
I've also got a spare,, MINTY,, (no nicks,) cylinder for a Tri-Color that a former collector let my buy.
They are out there,, you just have to hunt for them!