Rare Olympus Pen F "Peverse" Ring

[emlopez]

Hi all. I recently purchased for this Olympus Pen F reverse ring and was my surprise when I discovered that the manufacturer had engraved "Peverse" instead of Reverse, as you can see in the pictures. Does anyone know of a similar case?

 

[emlopez]

Thanks for your information. I am a camera collector. From this point of view, would be interesting to collect all these rarities, perhaps in a more general section.