Refer to the serials here for a little guidance:
Pentax K1000 Serial Numbers - Pentax Serial Number Database - PentaxForums.com
This thread might also be of help, as it shows the differences between the different production runs:
https://www.pentaxforums.com/forums/8-pentax-film-slr-discussion/51190-k1000-...-database.html
K1000's aren't very pricey, you're probably going to be in the $30-75 range.
Adam
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