I recently picked up two vintage S&W Model 10s (M&P). Both near mint. Serial #s 6D37851 and D08127. Can anyone help me with dates of manufacture? Not really wanting to cough up the $26 for the standard catalog of S&W (of which I've read bad reviews), or the $30 for the S&W factory letters the manufacturer sells. Best guess at the moment is 1970s. Any assistance would be greatly appreciated. These may be more valuable when Weimar Republic-style inflation hits after the new emperor bankrupts the country. Thanks again.