Generally, the older the pipe, the larger the bore of the stem. Most stems were straight, but some tended to curve either up or down. For those who enjoy collecting clay trade pipes, we have added additional notes about maker's marks and stem stamping based on the work of Robert F. The diameter of the bowl had increased only about 3/8 inch and there was no noticeable increase in the length of the stem. 1640-1660: The size of the bowl increased slightly during this period and stems increased to between 10 and 14 inches. These, no doubt served as a model for later pipe development. (see Walker, TD pipes, Bulletin of Archaeological Society of Virginia, Vol.
1610 - 1640: This period saw the development of a flat base and a true spur upon which to rest the pipe. 1700 - 1770: One of the most striking features of pipe development during this period is that the top of the bowl became parallel with the stem. During the mid eighteenth century, extra-long pipe stems became fashionable, measuring between 18 and 24 inches in length with a stem bore averaging 3/32 inchs. Except for the occasional maker's mark (the pipe pictured is Dutch-1670-1700), the pipes for the seventeenth century were plain. 1660 - 1680: One such variation was the West Country style pipe that featured a curved bowl that lost much of its "barrel" look.
The effects of English pipe manufacture eventually came full circle back to the American Indians through the fur trade sometime early in the 1600’s.