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Satoshi’s coinbase transaction

The Satoshi’s coinbase transaction includes this following scriptSig:


There’s an unexpected thing that I don’t fully understand. What is this bytes sequence:
04ffff001d0104. Like that, I could eventually determine as 04 (size) + ffff001d + 01 (size) + 04

But I don’t think it’s the decode structure, so are you able to tell me what is this sequence number and what is its role ?