Hammond Transformer - Product VS Package Date Markings

This post is intended to clear up some confusion about Hammond Manufacturing brand transformers and their date/lot code markings. Hammond places a time stamp on their transformers at the time of manufacturing and another time stamp on the box when packaged and these are not the same. These markings, since a transformer does not have any shelf life, would be used only for product traceability and warranty purposes.

When looking for a marking for either of these purposes the marking on the transformer itself is best, however either marking will suffice. The markings in question are a four digit code in the WWYY format. See 160D24 and the following images for example.

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If there are any questions on this, please reply to this post and we will be happy to address them.