Quote:
Originally Posted by springer
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.
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Slightly heartbroken now after taking out the insert on my 1675 and seeing a blue back. Lol.