Thus, utilitarian bottles a pontil scar can date as early as the early 1850s (rarely earlier) and pontil scars can be found - though very infrequently - on utilitarian bottles made in the late 1860s and even early 1870s (Toulouse 1968; Newman 1970; Munsey 1970; Watson & Skrill 1971; Innes 1976; Jones 1986; Jones & Sullivan 1989; Mc Dougall 1990; Pastron & Hattori 1990; Van den Bossche 2001; empirical observations).There were also regional glass maker differences for this transition period also.A more economic alternative would be to map a glossy texture to a voronoi pattern. I just tried the fracture tool, not exactly accurate but close.
However, the transition time for conversion from the pontil rod to the snap case was lengthy for utilitarian bottles.
The first use of the snap tool in the United States may have been in the late 1840s (in Europe possibly as early as the 1830s) though its use was definitely evident by at least the early to mid 1850s.
The point here is that close scrutiny is often necessary to conclude that a pontil rod was not used in the manufacture of what appears to otherwise be a very early bottle.
The rest of this section is an overview of the main types of pontil scars: glass tipped pontil scar, blowpipe pontil scar, sand pontil scar, and bare iron pontil scar.
These bottles would then appear to have been produced with a snap case tool when in fact they were made with a pontil rod.