Get this book, The Well-Appointed Bath: Authentic Plans and Fixtures from the 1900's by Gail Caskey Winkler.
This book is out of print but ebay currently has ex-library copies for sale. You could always check your local library as well.
This book is actually a reprint of 2 different plumbing fixture catalogs. One of the catalogs is an American Standard catalog. Your corner bathtub is the Pembroke model if I remember correctly ( i have a tub similar to it called the Woodmere sitting out in my back yard). Of most interest to you will be the page that shows the colors (with the colors name) that the plumbing fixtures were available in.
The other catalog reprint in the book is of a 1914 J.L. MOTT catalog. It is by far and away the best bathroom plan book I have ever seen. I wish that I had found this book 5 years ago when I started my bathroom project (along with bungalow bathrooms). It would have saved me a ton of trouble, and money.......blah blah blah
Ohmega Salvage has a "page" of colored bathroom fixtures for sale on their website. Here are some other architectural salvages: columbus architectural salvage, white river architectural salvage, thisoldtubandsink.com, antiqueplumbingfixtures.com, demolitiondepot.com, historichouseparts.com
All these salvages have websites with online inventories. Most of them also say they cannot possibly post their entire inventory, so give them a call with what your looking for.
Good luck. Searching for oddball stuff is fun.......................for awhile anyways.......if you can't ever find what your looking for it just turns out to be a pain in the ass.
It's not a Sears home, it's an Aladdin!