5500 Air King matt black index dial question

[jscom]

I have a silver dial 5500 Air King (wonderfully serviced by RSC) and I am thinking of adding a black dial to my modest collection at some point in time. I am doing some research now and it appears that there exist several variations of the black index dial, with different styles of indexes and with either gloss or matt dials.

My question to you is about matt black dials: from what I have seen so far, they seem to be less frequent than gloss black dials. Is this indeed the case? Does it mean that matt black dials have only been available during specific years or for specific markets? Is there anything specific to matt black dials I should be aware of or cautious about?

Basically I am interested in anything you know about 5500 matt black index dials!

Many thanks :-)