Greg:
Those cabinets are indeed St. Charles. Of all the metal cabinets on the market at mid-century, St. Charles' were the highest quality. I had a St. Charles kitchen a couple of houses ago. In my book "PreFAB Elements", there are some photos of an early St. Charles kitchen installed in Frank Lloyd Wright's "Fallingwater"- Wright loved prefabrication.
My St. Charles cabinets were pineapple yellow, with white counters. The cabinets were terrific, the counter colour was a mistake I will never repeat. The kitchen had 33 front feet of countertop and backsplashes that went all the way up to the bottoms of the wall cabinets. I used to go through Windex by the case; keeping all that white WHITE was a real pain.
I still miss that kitchen. All shelves were adjustable, and there were roll-out units for canned goods, pots and pans, and bulky things like mixer attachments. They wiped clean very easily. And they never warped in Georgia humidity; the drawers and doors never stuck or scraped. I do not understand why metal cabinets are so hard to find nowadays- if you've had them, you tend to like them better than any other kind. In my next book, there will be some resources for them.