I just spotted this on eBay, what appears to be a soft 554 in the pretty hard-to-find color of white.
As some of you know, I already have a white '58 554, one that I believe has never been in active service due to no normal wear on the chrome switchhook or any other part of the phone. This phone seems to be pretty far from perfect...

The listing picture looked like it was yellow, but some pictures inside the housing/handset/caps showed that it was actually a very faded white. The cord is also stretched a bit, and there are stickers all over the housing.
Worst of all, some idiot decided to try removing the housing by prying it off in the corner! Result: one huge crack! I think some epoxy should take care of that.
The good news is that all dates seem to point to November/December 1958, which makes it 57 years old this month! After a little refurbishing, it should look great!
Overall, pretty happy, especially for getting it for $29 BiN! I'm proud to own it!
www.ebay.com/itm/141820251273