Z1OwnersClub GB

I have had a look in search and still unsure about location of ignition switch key number. I have found a faint number on the switch housing 025-0U77, I dont think this is a key number. Do i have to remove the roll pins to gain access to the ignition barrel and thd number?
Cheers Rob

the no is normally stamped very small where the pin for the steering lock exits the switch the no will start with a letter Z you will need a magnifier glass to read the no