The most commonly recognized form of antique clock, typically referred to as a Grandfather clock. The cases of these clocks range in size, but are normally around eight feet tall. Considered a luxury item at their time of manufacture, the cases are often constructed of vibrant, high quality hardwoods and can feature elaborate inlays, carving and paint decorations. They were abundantly produced throughout the county and appear in great regional variety. The form began to dwindle in popularity by the 1830's, and was replaced by less expensive manufactured examples.

Developed at the beginning of the 19th Century by renowned clock maker Simon Willard in Roxbury, Massachusetts. He called it his "Willard's Improved Patent Time Piece". This reliable and affordable style quickly replaced the tall clock in many local regions and significantly influenced American clock making. This style of clock has never gone out of favor and numerous examples were produced into the 20th Century. The form is prone to restoration, especially to their glass panels and very few early examples survive in original condition.

An extremely rare and unique clock form developed by Simon Willard in the 1820's. It was created to offer an alarm mechanism in a high-style shelf clock. Originally known as the "Patent Alarum Timepiece", they have become known as Lighthouse Clocks, for their obvious similarities. Manufactured in the Classical style, the cases are quite varied and can be paint and stencil decorated or mahogany with decorative gilt brass mounts. Very few lighthouse clocks survive and it is thought that fewer than one hundred examples of this highly sought-after form remain.

This unusual variation appears in a scaled-down form, made to appear as a tall case, but measuring around four feet tall. The style was previously referred to as a Grandmother clock. It was produced primarily in Southeastern Massachusetts, particularly in Hingham and Hanover, during the first quarter of the 19th Century. These diminutive cases appear in distinctive varieties, including both mahogany and paint decorated pine examples. They were produced as a more affordable alternative to a full size tall case clock.

A spring driven shelf clock, produced throughout the 18th and 19th Centuries. A form produced primarily in England. Nearly all examples that bear American clockmaker's names were imported from Britain. It was common practice for American clock makers to order English bracket clocks, signed with their own names in place of the actual maker. Yet another very popular form that continued to be reproduced through the 20th Century.

A distinctive variation popularized in Massachusetts and commonly referred to as the "Massachusetts Shelf Clock". These clocks were most fashionable during the first third of the 19th Century and commonly appear in two distinct configurations. The earlier variation has a wooden front and a kidney shaped dial. The later form features a round dial with a glass front that is often decorated with reverse painting. Rare early examples are found with brass dials and wood fronts.

These small clocks were made in Grafton, Massachusetts during the last quarter of the 18th Century. These rarities were developed by Simon Willard and his brother Aaron and represent their early attempts to produce a small wall clock. These clocks appear with brass dials and often a passing strike with a movement of only a thirty hour duration. These are among the rarest of all American clocks.

The American version of this clock was produced during the first third of the 19th Century. The form was developed and popularized in England, but did not have the same success in America, subsequently examples from this period are relatively rare. The majority of tavern clocks were manufactured in New England, primarily in Boston. In the late 19th Century, similar production examples were introduced in the form of the "School House Clock". The values of these later clocks are significantly lower than early examples.

An attractive design that features a split column frame and a mirror in the lower tablet. These popular clocks were primarily produced in New Hampshire during the 1820's & 30's. Due to their fragile nature, mirror clocks are another form that is prone to have restoration to the glasses, with few examples surviving in original condition. Examples continued to be produced in New York and Connecticut until the middle part of the 19th Century.