Henry Nock was a highly respected and very talented British gunsmith, who manufactured a wide variety of arms including military muskets for the British Army. He is probably best known on the internet for his 7-barreled volley gun (which fires all seven charges simultaneously), intended for naval ship boarding operations. This particular gun resembled that volley gun design, but is actually a self-priming flintlock pepperbox. Its cluster of 6 barrels is manually rotated, allowing the used to fire six separate shots before needing to reload. The priming mechanism and lock bear a remarkable similarity to the Collier repeating flintlocks, and it is suspected that this system was developed by Artemis Wheeler of the United States.
Collier Revolving Flintlocks: https://www.full30.com/video/007209576f7078b7a6365c7e0356cf98
Ferguson Breechloading Flintlock: https://www.full30.com/video/db2cfad70e58e93bff4872b858cf23a0
Allen & Thurber Pepperbox: https://www.full30.com/video/d586c777c59627ed60ec25c031a82378
Lorenzoni Repeating Flintlocks: https://www.full30.com/video/0949f327e3e2ff5c388c1fa48a407f58