Peter Harris Clocks & Militaria has dated this piece to the 18th Century.

Circa 1790.
Thomas Ketland & Co. was a firearms manufacturer founded in Birmingham, England c. 1760.
Thomas Ketland Senior, was a highly successful Birmingham gun maker. He started his business around 1760 and expanded into the export market around 1790. He died in 1816. The business carried on until bankruptcy in 1821. The company manufactured flintlock pistols, becoming quite successful in its field.

W. Ketland was Thomas Ketland Sr's eldest son. He was originally a partner alongside his father and William Walker. He petitioned to liquidate his part in the company in 1800. The partnership was dissolved in 1801. He died in 1804 but the business carried on to at least 1831. The story about an earlier W. Ketland gunmaker, going back to the 1740s (Gardner says 1715), is not verified. The directory dates are 1808 to 1831 but W. Ketland was trading under that name as early as the middle of 1801 and perhaps as early as the end of 1800. The Philadelphia Ketlands are 2nd son Thomas Jr. and John. Thomas Jr. resided in Philadelphia from 1789 to 1815. John died there in 1800. They never manufactured weapons. They were merchant princes, not mechanics and arms were only a small part of their business. Around 1801, Ketland Co. began trading overseas and the company ceased operations around 1831.

William Ketalns, Sr., had two other grandsons, Thomas and John Ketland, both gunsmiths who worked on a co-operative basis with William Ketland under the name Ketalnd & Co. However, Thomas and John emigrated foto the USA in 1780. A number of American Kentucky rifles had Ketalnd & Co locks.

Ketland & Co flintlock pistols and fowling pieces are noted for their fine workmanship and design.
A. Merwyn Carey (1954) English, Irish and Scottish Firearms Makers, Acro Publishing Company, New York.
For condition which I think is excellent especially considering age, please view my photos.
Measurements
Barrel length 22cm
Overall length 36cm
Weight Each 110 grams
Peter Harris Clocks & Militaria has dated this piece to the 18th Century.
We specialise in flintlock pistols, muskets, clocks & watches
You can view the stock and full dealer information on the Peter Harris Clocks & Militaria Profile Page