I remember the answer to this question from when I asked about my brown fledgling’s number.
When Melody signed the first batch of brown fledglings, she thought it would be a good idea to number the number of batches of fledglings they have produced, I’m assuming so they could keep track of how many batches they had produced. The number 1 means it was from the first batch. She immediately stopped numbering them because so many people became confused, believing they had a signed numbered piece like the numbered pieces from eBay. So there’s only one batch of brown fledglings with a number 1 on them.