[peterus]

This is true, for example many stm32 series have a 96 bit unique id which is derived from the lot number, wafer id and position [1]. Even the low cost stm32g0b1 series I am using has them, but they are missing from some older series.

[1] https://community.st.com/t5/stm32-mcus/how-to-obtain-and-use...