Quote:
Originally Posted by HarryLime
Can anyone tell me what year the blueback inserts first appeared? They were never standard issue for 1675s, correct? Only as service, and then later standard issue for 16750. Do I have that right?
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GMT 1675s all had red backs with red backs continuing through the end of the matte-dialed 16750s. It might be possible to find late 16750 mattes with blue backs - I can't say for sure - but, based on my experience, 1984 seems to be the time frame for the arrival of the blue backs with some time for transition between the two.