# What are the seemingly random letters printed on Duncans?

**URL:** <https://forums.yoyoexpert.com/t/what-are-the-seemingly-random-letters-printed-on-duncans/337740>\
**Category:** General Yo-Yo\
**Created:** [April 27, 2021, 8:07am UTC](https://forums.yoyoexpert.com/t/what-are-the-seemingly-random-letters-printed-on-duncans/337740 "2021-04-27T08:07:58Z")\
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**Author:** ![bjardin](https://sea1.discourse-cdn.com/flex015/user_avatar/forums.yoyoexpert.com/bjardin/32/129600_2.png) [@bjardin](https://forums.yoyoexpert.com/u/bjardin)\
**Post date:** [April 28, 2021, 11:53am UTC](https://forums.yoyoexpert.com/t/what-are-the-seemingly-random-letters-printed-on-duncans/337740/3 "2021-04-28T11:53:04Z")

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Those are date codes.

Date codes are one of the requirements to pass the safety testings. Not many yo-yo companies do safety testings to you rarely see this.

It is also an indicator of the production run. Let’s say something is wrong with the production run ABCDE, we can easily pull out the ABCDE batch instead of the entire inventory.

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