I have looked at a few Curtas and all the ones I have seen on ebay and from this site show the "Curta" trademark on the case. Mine doesn't have this but it has all the correct markings on the bottom saying where its made, etc. Is this a rare thing? I ask because its the only one I have seen without the markings. Thanks all.

The plastic cannister generally had a metal sticker that said "CURTA" and "Open" with an arrow. The glue that attached the sticker to the plastic was very strong, but sometimes did fail. Obviously, the sticker has fallen off the plastic cannister for your Curta. Do not worry, there are replacement stickers available...although they are expensive.

Thanks again Jack!!