An excerpt from a ledger recording appointments of Wilson County postmasters, including Samuel H. Vick:

Vick’s appointment dates were 28 September 1889, 27 January 1890, and 24 May 1898.

(Click to enlarge.)

Record of Appointment of Postmasters, 1832-1971, records of the Post Office Department, Record Group Number 28, National Archives [database on-line], http://www.Ancestry.com.