Serial numbers ran from "no suffix" through "z" without the "j" used, and then cycled through again.
Some of the manufacturers restarted them each year, others just kept going until they cycled from "9999z" or "10000z" to "1" again.
It may be possible to determine things from marks and other details. Post good photos.
See our FAQ document for more details.
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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