Can anyone ID this edge tile and suggest where to look for a replacement?
You probably have done this,but if not, look on the inside and see if you see an emblem stamp. Take a photo of it and post it.
Best thing to do is take some pictures with the tile next to a tape measure and e-mail them to reclaimed / salvage tile company’s and see what they have.
Most likely Boral (formerly MonierLifetile) 90 degree rake trim for extruded concrete tile. Not uncommon. If you are anywhere out west, Texas or in Florida you can easily acquire this product. The backside of the trim tile should have the manufacturer’s name embossed on it.