A quick google search yielded this:
http://www.nationalgunforum.com/rif...0-06-calibre-model-1640-lightweight.htmlHusqvarna basically used only four different mauser-type actions.
The Swedish Mauser model 94Used from 1927 to 1949
After WW2 it was called model 38, it also lost the thumb cut-out.
The German Mauser model 98
Used from 1937 to 1956
Made by FN in Belgium in two types, the main difference is that
the new type doesn't have the thumb cut-out and that the bolt
handle is swept slightly back.
Husqvarna model 1640Husqvarna was not comfortable with the fact that they were
depending on one of there competitors. So they developed an
action that in some ways resembles the German Mauser model 98.
It uses a long mauser 98 type extractor and mechanical ejector
but got a sliding safety catch.
It was released in 1953 and discontinued in 1967.
Husqvarna model 1900In 1967 Husqvarna released a new action. It uses short modern
extractor and ejector. It got a small extra guiding-lug on
the lower locking-lug. The cocking-piece got a new shape and
looks like the one on the present Carl Gustaf 2000 rifles.
Since 1950 Husqvarna have mainly used cold-hammer forged barrels.
A very crude and simplifyed list of Husqvarna rifle models
Model 46
Swedish m/94 action
Approximately 25000 made
Calibre 9,3x57 9,3x62 6,5x55
Model 146, 246
FN made M98 action (old type)
Approximately 12000 made
Calibre 9,3x57 9,3x62
Model 646, 648, 649
FN made M98 action (old and new type), and Swedish m/38 action
Approximately 64000 made
Calibre 6,5x55 8x57JS 9,3x62
220Swift 270Win 30-06
Model 1000, 1100, 2104F
FN made M98 action (new type)
Calibre 220Swift 270Win 30-06
Model 1640, 1740, 2100, 1600
Husqvarna 1640 action
Calibre 270Win 6,5x55 30-06 8x57JS 9,3x62
Model 6000, 3000, 7000
Husqvarna 1640 action
Calibre 7mmRemM 308Win 270Win 30-06 243Win 9,3x62
Model 1651
Husqvarna 1640 action
Calibre 358NM
Model 1970
Husqvarna 1900 action
Calibre 22-250 243Win 6,5x55 270Win 7mmRemM 300WinM
308Win 30-06 9,3x62 222Rem
Husqvarna's rifle production was sold to FFV Carl Gustaf in 1970,
and the production of the model 1900 continued in Eskilstuna until the end of the seventies.