Tom Debski notes that this Latrobe is not (as I claimed) the maker of Rolling Rock, rather he says:
In 1899, 21 brewers consolidated to form Pittsburgh Brewing Co. About 6 of these were substantial breweries. One, the Latrobe Brewery, was only worth $8000 altogether. This was neither the small brewery of the Benedictine Society, nor the current Latrobe Brewing Company which produces Rolling Rock Beer.
-- Barron, Stanley. Brewed in America. Boston, 1962.