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I'm not sure it is the right number/info I should provide to You, but reading from the display of my radio, SN is OBJM033487 (1-6 key combination gave me this SN). It's Fiat Stilo CD radio (without MP3), probably made by Visteon 😉 in year 2003.
I haven't had chance to remove the radio from the board yet (I'll have to make "that special tool" from "hanger's wire" to release it from car's dashboard ;D ), so if this info is not sufficient, please say which numbers are necessary for You to retrieve the code.
Thanks in advance.