speedmasters with transparent casebacks

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i recently purchased a speedmaster bianco italiano. . .limited edition of 500. i did not realize when i purchased it that it has a transparent caseback. i quite love that about the watch. . .it got me wondering what other Speedmasters have transparent casebacks ?

(sorry the pictures aren't great)
 
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Congrats for your purchase ! Enjoy it and wear it in good health 👍

This is how it started : 20 Years Flight Qualified for Space



1000 numbered pieces produced back in 1985 😉
Edited:
 
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I believe fratello did an article on the early clear backs. The first was the gold ones from 1980 I believe
 
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The first was the gold ones from 1980 I believe

😟 Ahhh true ! Mine was the first steel 👍
 
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I installed one, when I found out to my disappointment that these didn't work:

 
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Kinda a Speedy.. 😉
 
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The new 44.25mm Co-Axial Speedmasters have the glass display back.
I'm not a fan. I'd prefer a lower profile metal back.
 
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Here are some with the first being on the left😀