Original color of a Optimus 111

Hello,

Someone is offering me a complete black Optimus 111 stove for sale. He says it is original and made in the 60s. I check this forum, Google and eBay and cannot find an original "black" Optimus 111.
I find mostly blue one's and army green stoves. On eBay is also a light green Optimus for sale which pretends to be original with a nickel plated tank.
The stove that has been offered to me has also a nickel plated tank. Is this common?

 

Hi

The case of the 111 C ( Cobra ) is black

 

I've never heard of black ones from the 60's. Only blue.

 

It is not a 111C. It is a 111 (original without an added letter)

I have seen it quickly. I'll make some pictures next week. I really think is it repainted.

 

Blue (light and dark) and military green. I am not sure about the light green as the one on eBay. I have not found a picture of this color in the gallery.

 

The early ones were very dark green, like 11's.
You can recognize it because the hinges are different.