Qts.

From English term quarters, i.e. living quarters, by shortening

Qts. (uncountable)

1. (US, military, in postal addresses) Abbreviation of quarters used when addressing mail.
   • 

     James Longuemare Mooney, draft registration card
     1943, Mooney, James Longuemare, draft registration card:

     Name and Address of Person Who Will Always Know Your Address:

     Col. J. S. Mooney — Qts. 13 Fort Bliss, Texas

   • 1958 December 18, “For Sale:—Boat”, in The Panama American, volume 34, Colón: The Panama American Press, Inc., OCLC 237296453, Classifieds, page 10, column 6:

     Priced for quick sale, call 83-2127 after 4:00. Qts. 2151 Curundu.

     (newspaper preserved by the Panama Canal Museum and the George A. Smathers Libraries.)

• QST