This is a Wenger Standard Issue (model 1961), which was issued to the soldiers in the Swiss army. This particular one was issued in 1983.
The ’83’ blade stamp means this knife was issued in 1983.
Old style swiss shield logo
The knife has a W-K stamp, which stands for Waffen Kontrol. It means the knife passed the Swiss army quality inspection.
external links: SAK Wiki
This is a Victorinox Soldier (model 1961), which was issued to the soldiers in the Dutch navy. On the engraving panel is says “KM 87” which means it was issued to the soldiers in the Koninklijke Marine (Royal Navy) in 1987. 1987 was the only year the Dutch Navy issued the Victorinox Soldier, which makes the KM87 a very rare bird!
external links: SAK Wiki
This is a Victorinox Soldier (model 1961), which was issued to the soldiers in the Dutch army. On the engraving panel is says “KL 83” which means it was issued to the soldiers in the Koninklijke Landmacht (Royal Army) in 1983. Before 1983 the Dutch army knives were made by a different manufacturer (Amefa). Since 1983 until now the Dutch army knives are made by Victorinox.
The knife has the old plain silver cross logo, a bail and brass liners.
external links: SAK Wiki