Hi-
I think it is a kid's stamp. I have had a lot of the fine pen premiums and have never seen that stamp. If it was a watermark or Chicle stamp it would be more prevalent (in my opinion). Regarding using ChatGPT, did you state that the item you had is a Chicle fine pen premium? If so, then it probably guessed that it is a watermark based on your prompt. If it said that without you stating what company made it, then that could be different.
Alan
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