Eric Frost was one of the major knife companies in Mora, Sweden. I have several. Most date from pre-1960. He commonly used laminated steel which yours apparently is also. Have not seen a sheath like that nor handle; perhaps this is a custom made/home made knife. It was not uncommon to buy blades and mount them yourself. Most sheaths of that period were either leather or Unica (sp?). Really nice find. Below is a partial section from the Swedish Military knives site. Hope it helps.
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Sweden has a long tradition of making knives. The most commonly used knives
used in the Swedish forces are the ordinary Mora knives.
The story behind the Swedish well known knives of Mora.
The life was very poor for the farmers in the area of Mora during the 18th century.
You will find the town Mora in the centre of Sweden in the middle of vast forests.
The farmers during the 18th century had to find themselves complementary ways
of living. It was during those circumstances that Erik Frost Eriksson started to
produce knives. Later on he started in his factory 1891 to produce what we today
know as the knife from Mora or Mora knife. The factory is still remaining in a small
village called Ostnor. His company made a lot of different utilities from steel in the
beginning, like tools for the forest like an ordinary blacksmith.
Around 1900 the knife had been so popular that the production of it became the main article.
The steel in the old “original” knives came from Vikmanshyttan and some other Swedish steel
producers. The grip was made out of birch which came from Småland some 400 km south by
Mora. The scabbard was made of millboard which was decorated in different patterns.
The scabbard were made in Tidaholm, which you will find some 360 km south by Mora.
Once upon a time there were lots of producers who copied the knife of Erik Frost.
Some of these where companies were Krang Johan Eriksson (KJ Eriksson), the brothers
Jonsson, F.M. Matsson (FMM) and Bud Carl Andersson. (CA Mora). These companies,
although they were making competition to each others, also supported and helped each
others. They were all situated within a small area close to the town Mora. They
disappeared one by one and now Mora of Sweden is the only remaining company.
Today Mora of Sweden produces some 250 different models in Ostnor. Today the
steel is stamped out of the steel from Sandvik 12C27, which is the same steel
like KaBar used in their “Next Generation Fighting Knife”. The grip is normally made
from plastic like the scabbard, but still you can buy from them the old style carbon
steel knives with red wooden handles.
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Rich