unique distinction

1a. This is the most unique distinction.
1b. This is a most unique distinction.
1c. This is a unique distinction.
Please correct all.

No correction necessary, though the contexts would change.

‘unique’ is an absolute/non-gradable adjective.
So it doesn’t require additional adjective like ‘most’.
Am I wrong?

If you knew that (and technically you are not wrong), why on earth did you ask the question in the first place about whether it was correct?

It’s not a requirement, but it wouldn’t be wrong to add it for emphasis.

blog.oxforddictionaries.com/2012 … portunity/

“However, sometimes the situation isn’t so cut and dried. There’s a set of adjectives (including perfect, infinite, and unique) which fall into both categories, gradable and absolute. These words have a central or original meaning which represents a philosophically or mathematically absolute concept, but they’ve also developed new and less precise meanings.”

“… But language change being what it is, unique has developed a weaker, less precise meaning: ‘very remarkable, special, or unusual’. The historical Oxford English Dictionary first records this sense in the 19th century, and it’s now well established. The ‘very remarkable or special’ meaning is not an absolute concept and is therefore gradable, so it’s grammatically acceptable to use modifying adverbs:
√ I saw a guy wearing some really unique eyeglasses.
√ They’ve devised a highly unique way to cook and serve meals.”