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I bet the numbers are A1709, assembly on the 170th day of 1969. This is right after the 162 casting date.
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Don't think so. Pretty clearly a C:
http://s74.photobucket.com/albums/i2...urrent=007.jpg
Here is one of the casting number and date. The casting numbers are not raised, but rather concave. The date numbers are raised.
http://s74.photobucket.com/albums/i2...urrent=001.jpg
Anyway, hope this helps.
Lynn