Jeff. Amherst is probably Jeffrey Amherst, 1st Baron Amherst (1717-1797), Field Marshal.
Found in 3 Collections and/or Records:
Drafts or rough copies of outgoing letters, mostly from St Lucia, describing regimental affairs, rules and conditions of service, the need for more officers, pay and funding.
Returns of the various regiments composing the British Army, written in a clerical hand, 1 December 1760, 38 folios. The figures for officers, non-commissioned officers, effectives, and contingent men are tabulated for each regiment. There follow an abstract of the militia and a summary of the disposition of the forces in North America. The last is signed 'Jeff. Amherst, Quebec 4th October 1760' (not autograph).