Sorry, but the typeface alone won't help you date your sample that precisely.
Metal typefaces had long lifespans/periods of use. Faces introduced in the 17th and 18th centuries were still in circulation well into the 19th century and beyond, often refined and reissued but still relatively close to the original design.
From what little detail can be seen in your samples, it appears to be some form of Caslon (the same typeface used for the first printed copies of the Declaration of Independence), which was introduced in 1720 (EDIT: first specimen sheet published in the 1730s). It fell out of favor by the early 1800s, but enjoyed a revival around 1840 and still exists in a number of digital variations today.