I wasn't really looking for an "authentication". I'm familiar with The Vintage Fashion Guild as I've been dealing in vintage for many years & have always found the forums kind & helpful, not judging, thank you. Also, people like figuring out a mystery, as these are an interesting pair. And I would never want to represent a sale item as something it isn't.
These state they are Lanvin, Paris shoes. The label is certainly of the Lanvin, Paris variety, circa late 70s, 80s. As this look was very popular in the early 80s. I simply wondered if anyone else was familiar with Lanvin--the couture line. And what they thought.
Also, the size 24 1/2. I saw a Canadian sizing similar, but still, an oddity. I would put them at a US 7 approx.