All Keenz Wagons have a sticker on the frame with the lot number. Here is an example of what the sticker will look like: ![][1] [1]: https://hf-files-oregon.s3.amazonaws.com/hdpthestairbarrier_kb_attachments/2023/01-24/a575fafc-0e06-4e7f-8e6c-450cfde4994a/thumbnail_image0_1.jpg