At this early date most bayonets would be privately sourced by the individual regiments to the requirements of the commanding officers,  very few bayonets would have been supplied by the Board of Ordnance.  Some of the key features of bayonets from this period are the lack of a rear reinforcing collar on the socket,  the shield attachment between shank and socket and the large guard at the back of the blade.

The blade length would have originally been a nominal 17" (432mm). 

Typical weapon marking used to identify the musket to which the bayonet fits properly.  The '5' part of the '25' weapon number is of an early form,  with a distinctive upward curl to the top of the figure five.

Recent research⁽¹⁾ has revealed that this particular bayonet was part of a stand of bayonets supplied by a William Predden to the 3^rd Guards c.1715.