This is a really spectacular circular embossed advert showing a plate of biscuits.
Sadly I have not found it in the Trade Index, but there are plenty of other fascinating items which are probably also of interest to ephemera and advertising collectors as early biscuit advertising seems to have been produced not as the standard sized trade cards we knew in our youth, but on larger cards or even postcards.
Macfarlane, Lang and Co started out in 1817 in Glasgow as simply Lang`s bakery. However James Lang had a nephew, called John Macfarlane, and the two teamed up, becoming Macfarlane Lang in 1841.
Oddly they never had a biscuit factory until 1886, but by 1903 they were running the Victoria Biscuit Works in Glasgow, and the Imperial Biscuit Works in Fulham, London.
The next year saw them becoming a Limited Company.