A 5000 series SOG Knife owned Capt Frank Vecchiarello (known as Vic). Frank was a 1-3 at Kontum, CCC. This features a type II blade and type II sheath. Other items from Vic are featured below.
The SOG Knife was designed by Benjamin Baker, the Deputy Chief of the U.S. Counterinsurgency Support Office (CISO). A chrome-moly steel known as SKS-3 was chosen for the blade and hardened to a Rockwell hardness of 55-57. The blade pattern featured a convex false edge on the clip point of a Bowie knife. The stacked leather handle was inspired by a Marbles Gladstone Skinning Knife made in the 1920s owned by Baker, into which finger grooves were molded. The blade was typically parkerized or blackened to reduce glare. This was done so by applying a dark gun-blue finish (similar to those used on guns) on this carbon steel knife. The knife was carried in a leather sheath which contained a sharpening steel or whetstone.
The first contract was awarded to Japanese Trading Company Yogi Shokai for 1,300 seven-inch blades designated "Knife, indigenous, RECON, 7", w/scabbard & whetstone" at $9.85 each. In 1966, SOG ordered 1,200 sterile knives with six-inch blades and black sheaths and in March of the following year an additional lot of 3,700 was ordered. This second lot was serial numbered for accountability purposes and was designated "Knife, indigenous, hunting, 6", w/black sheath and whetstone". Further knives were ordered from Japan Sword as well. The orders were actually fulfilled by a number of knifemakers and a result, the various lots had minor differences such as blade bluing color and guard color or shape. Although the SOG office based at Kadena and Yogi Shokai were in Okinawa, it is believed that only a major knifemaking source like Seki could have fulfilled all these orders.
Other items from Vic are featured here and here.