Vintage Proto heavy-duty socket wrench assembly consisting of a Proto 5556 1-3/4-inch, 12-point socket and a 3/4-inch-drive sliding T-handle matching Proto’s 5685 pattern. The socket retains partially visible Proto and Los Angeles manufacturing markings, along with Canadian service reference R5069. Proto’s period catalog identifies the 5556 as a 1-3/4-inch 12-point socket in its 3/4-inch-drive series, while the 5685 is the corresponding sliding handle.

Issued under reference 26BG/R5069 with additional number A4674, the assembly was packed in April 1958 by the Aviation Supply Depot in Dartmouth, Nova Scotia. Includes the dated depot packaging, heavily deteriorated preservation wrapping, outer box and attached Royal Canadian Navy C.N.S. 118 serviceability tag shown. The exact aircraft or equipment application has not been confirmed.