The notations, above, from her book, describes the purchase of a new gold watch. The gold value being 12 pounds and 8 shillings and the watch overall costing 23 pounds. She has dated this purchase 2 August 1703.
We then see that a month later on the 24 September 1703, a chain for her watch was 5 pounds, 8 shillings and 8 pence, the total cost coming to 6 pounds and 12 shillings.
I had a bit of fun with an historical money calculator and the result for 12 pounds in 1703 would equal almost 2000 pounds today. In Australian dollars we could surmise about $3800.