The 1871 census lists 45 Key Hill as :
Wallace Winkles 24. glass engraver. born birmingham
Alice Winkles, 26, wife, born birmingham
Wallace winkles, 2, son, born birmingham
John winkles, 1, son, born birmingham
Samuel smith, 18, boarder, cork cutter.
So it is a father and son, but , because of other 1872 directory entry there must be another Wallace, unless he was into glass cutting and lapidary. Mullis & Winkles is listed in directory at 104 Great Hampton st, which in the 1871 census has Edwin Wright and his family (eating house keeper), who is also listed in the directory as "eating rooms", together with a zinc plate worker.
in fact the census 1871 lists 5 Wallace Winkles:
The two at Key Hill
Two at 194 wells St, one of them 33, gold swivel maker, wife eliza ,31, both born birmingham with sons Wallace F. , 4 , with florence F, 6, Alexandra F. 8 and Eliza , 10
And one aged 6 , at 16 snape St, son of a gold cutter , William Winkles,