Assertion: bottle's base | /r/HasAspect | pontil mark
Facets:
value: often
type: TEMPORAL
Source sentences:
text: Keyed bases are highly indicative of a molded bottle made between the late 1840s and the early 1870s and will often have a pontil mark superimposed over the mold seam, dating them prior to about 1860 (McKearin & Wilson 1978).