Lanvin Black Shoe Label

Hello! I just recently acquired these three pairs of Lanvin heels. This is the first time that I encountered this type of Lanvin label. I tried researching online, to no avail. So my last resort is finally posting this here because there are a lot of people here much more knowledgeable about vintage labels than I am. Is this kind of label authentic? If yes, from what decade is this? Thank you in advance for any help or information!

 

You might post a picture of the interior size stamping and shoe's sole. I *think* these are not vintage.