121/122 ( original numbering Back in the PTE days): Tunstall Rd / Leechmere Rd - Grangetown- City Centre 

Then 

121 via Roker Park Rd and Park Avenue to Seaburn Hotel 
122 via Sea Front to what was then Seaburn Camp terminus. 

Both routes withdrawn in 1983 and merged into existing 118 and new 119.