To understand the Glock field knife,
one must learn of it's history.
And it begins in 1975
when an Austrian firm, Ludwig Zeitler had proposed to the Austrian Army, the Zeitler 77.
It was well received.
Unfortunately, it went broke, and could not compete for the Austrian military's
bayonet tender for it's newly introduced bullpup Steyr AUG
http://www.steyr-mannlicher.com/uploads/media/STM_Produktblatt_AUG_A1_A2_press_01.pdf
So, in it's place for the running was
AES (A. Eickhorn Solingen) which later produced the AES FM80 field messer/knife
!
As was the Puma Commando 9500
http://www.pumahunter.de/page2.php?view=preview&category=31&image=1153
http://bacotacticoscuchillos.blogspot.my/2008/06/puma-tctico.html
Later, Marto of Spain had a (non-hollowed out pommel) field knife version.
M78 unlicensed copy, the "Austr. bayonet"...
(probably asian made; marketed in EU under the Max Fuchs in-house label MFH Int.Comp.)
notable difference is the lack of the tab/cover on the pommel for bayonet adapter
which means there's no cavity on this one.
https://tacticalatzengear.de/?p=841
Anyhow, Glock being Austrian, won the contract and makes the rest history.
Denmark's issued Glock knives are known as Feltkniv M/96
The thing is the Austrians required a bayonet.
http://worldbayonets.com/Bayonet_Identification_Guide/Austria/Austria_2.html
And that's what the Glock 78 is.
I don't think the Glock 81 with the saw back was ever adopted by the Austrians.
x-ray images of
Mikov AZ07, Glock 78, Sisspukko M95, Wz. 92
Sisspukko M95, Wz. 55, Mikov AZ 07, Glock 78, Wz. 92, Wz. 55
The Glock field knives have great strength for prying.
A wonderful sheathing system.
As a knife, it cuts; but my swiss folder cuts better.
So it's more of a combative weapon in my opinion.