In my experience, a bob was not a name for a pound, only for one shilling, which was made of twelve old pennies, or two sixpences. A sixpence was known as a tanner, hence the rhyme my Mum used to sing "Rule Britannia/Two tanners make a bob/Three make one and six/ And four two bob"
British Boy Scouts used to have "Bob a Job" weeks, when they went round asking householders if they could do small jobs for them, for a fee of one shilling. Girl Guides had something similar I believe with the slogan "Please give a shilling to a Guide who is willing", but that was dropped owing to the possible connotations of the term "willing".
A pound is still known as quid. Half a crown, two shillings and sixpence, was "Half a dollar". A two shilling piece was a florin.
I was interested in the origins of "Tanner" etc. Cabbage weevil. An old uncle of mine who had been in the Army in India in the 1920s used to say that something of very low monetary value wasn't worth a pice, this being a low denomination Indian coin.