C1 is a ticket zone for Merseytravel former Zone Ticket scheme Merseyside was split in to four zones. A for St Helens, B for Wirral, C for Liverpool, Knowsley and South Sefton, D for Southport. There was a Zone AC meaning Knowsley/St Helens overlap. For Wirral commuters there was a B +C1 ticket. The lettered areas were split into numbered sub zones hence C1.Saveaway tickets used just the letters .
The C1 zone is the Liverpool area centre plus some suburbs, and it's difficult to identify where the stop was Hope this helps!
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