Have had this Blue Note for some time. Bought it with the worn out backglass, and since there were only 226 of these made, had figured out that a NOS back glass would be a tough find. Here are some photos of before and after.

Worn out backglass with peeling and missing art work.
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The backside with tape and possibly some clear coat.
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The new backglass from Steve at Mayfair Amusements in NYC. Steve sent some photos of the slightly worn off back silvering. Looked great to me as it is a 100% improvement from what I had. Could not be happier with the replacement.
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I will admit that the hardest part of this change was the dent in the Credit Card statement.

The area of white around the score reel windows has a slight pearl effect. Not a straight white colour.

Try BGResto again, they might have a repo backglass.