To better understand the accounting at the SFC, in a footnote we provide a brief outline of the 18th century Portuguese systems of weight (arratel), length (covado), and currency (real).
The quality of production was controlled and the cost per covado was computed.
The output was 66 1/2 covados so that the unit cost was approximately 1$301 reis per covado.
Full cost per covado was defined in a fashion similar to the French prix de revient, the total cost accounting system that Nikitin  found at Saint-Gobain between 1820 and 1880 and that Bordazar proposed in the Spanish printing industry in 1732 [Martinez Guillen, 2005].
Total costs were expressed as averages, in cost units of "cost per covado." (See Figure 1 where the unit cost of job order no.
In this paper, we represent arratel with the notation "a." A covado was 0.66 meters and was written [C.sup.do].