I foolishly jumped on an auction on ebay. Just a few minutes until a real brotform's listing would expire, so in a fervor, I bought the thing for ten bucks.
When the beauty arrived, it was about three times the size of a normal brotform. It's 15 inches wide, 12 inches tall, and covered with shellac.
My fellow bakers don't think it is a brotform. It was suggested that it might be a fuit basket. I suggest it's an antique, from the cook's hall in the French Foreign Legion. But in honesty, I don't have a clue whether it is an old brotform or something else entirely.