Looking at those ledgers brings back my curiosity of total production from the big names
Brybenn, I looked up Purdey numbers 1884-1983, as outlined in Richard Beaumont's book. He looked at the number of years it took for each 1000 guns in the numbering system, covering all shotguns, rifles, pistols etc. combined, instead of annual production numbers. Purdey had qualities ranging as Best, B, C, D, and E Quality. It could take 6 years to make 1000 (1885-1891), or 5 years (1921-1926, 1930-1935), or 4 years (1903-1907, 1926-1930), or at the most, 3 years (1891-1894, 1894-1897, 1897-1900, 1900-1903, 1907-1911, 1911-1914), not counting the war years. After WWII, production was very limited, where it took 15 years to make 1000 (1947-1962), or 12 years (1962-1974), then 9 years (1974-1983).
In the same time period, Boss & Co. were making about 40-70 a year (all types) until the 1900s, then slightly over 100 a year. After WWII production was very slow, about 200 guns total in 6 years, 160 guns total in the period 1956-1960, 130 guns in the period 1961-1965, only 50 guns in the period 1981-1985, some 90 guns in the period 1991-1995, and 70 guns total in the 4 years 1996-2000.
I would guess Holland & Holland numbers would be similar to Purdey's, or slightly more, as Holland perhaps had a wider range of both shotguns and rifles.
In the early breech-loading years, a maker would be lucky to sell 10 in a year, never mind 100!
So, when we shall gaze upon these beauties at the 6th Annual Double Gun Classic, it is worth remembering their interesting pedigree.