Well,
You can find pictures of a lot of models in the first pages of this thread.
As per why yours was modified, that's easy to spot, the butt (and, actually, the whole stock) is always a one piece on HVA stocks, unless it was midifed (excluding the Hellstock and the 456/458 models). The Std is the most common model and does not have any high comb and no cheekpiece either.
There are three basic "barreled actions" ;
1600 - This is the shorter barreled action, barrel being 520mm long
1640 - This is the most common configuration - 600mm barrel and also the 560mm versions
1651 - Only made in .358 NM, 660mm barrel.
Then, you have the stock style (this was posted many times in the past);
Standard = low comb, schnabel, no checkering on the forend
"K" (Konkurrensskäl) = Sandblasted / matte metal finish, same stock as the Std, but no checkering at all, walnut and beech.
MC = Monte-Carlo comb stock with cheek piece, oiled (early) or very shiny plastic varnish (late), french pattern checkering (late) and round plastic (early) or squarish rosewood (late) forend cap
Special = Like the MC Model, but usually have an adjustable trigger
Lyx = Schannabel, cheek piece, highly figured quality walnut, checkering on both pistol grip and forend
H (Hellstock) = Low comb stock, no cheekpiece, fullstock configuration
Then, in America, the equivalent models were;
Std = none.
3000 (Crown Grade and Presentation) / 6000 (Imperial Custom) - 600mm barrel, Monte Carlo comb stock with cheek piece, oiled (early) or very shiny plastic varnish (late), french pattern checkering (late) and round plastic (early) or squarish rosewood (late) forend cap
The 3100 is the same rifle but without the high Monte Carlo comb
7000 (Imperial) - High comb (MC) butt with cheek piece, Schannabel, highly figured quality walnut, checkering on both pistol grip and forend, adjustable trigger
4100 - 520mm barrel, schnabel forend, forend checkering, low comb stock with cheekpiece (pretty much the same as Swedish Lyx model)
4000 - Same thing, but with Monte Carlo High Comb.
456 / 458 - version of the same rifle, 456 is the full stock with forend checkering and low comb and cheekpiece, while 458 is the exact same with high Monte Carlo comb and cheekpiece
and the model 5000 or "Husky" which is an American only economy model, 560mm barrel, MC butt forend checkering, schnabel forend.
There are also sight differences betwrrn the high end and the lower end models, and some models were not treated here, only the most common ones.
You can find pictures of a lot of models in the first pages of this thread.
As per why yours was modified, that's easy to spot, the butt (and, actually, the whole stock) is always a one piece on HVA stocks, unless it was midifed (excluding the Hellstock and the 456/458 models). The Std is the most common model and does not have any high comb and no cheekpiece either.
There are three basic "barreled actions" ;
1600 - This is the shorter barreled action, barrel being 520mm long
1640 - This is the most common configuration - 600mm barrel and also the 560mm versions
1651 - Only made in .358 NM, 660mm barrel.
Then, you have the stock style (this was posted many times in the past);
Standard = low comb, schnabel, no checkering on the forend
"K" (Konkurrensskäl) = Sandblasted / matte metal finish, same stock as the Std, but no checkering at all, walnut and beech.
MC = Monte-Carlo comb stock with cheek piece, oiled (early) or very shiny plastic varnish (late), french pattern checkering (late) and round plastic (early) or squarish rosewood (late) forend cap
Special = Like the MC Model, but usually have an adjustable trigger
Lyx = Schannabel, cheek piece, highly figured quality walnut, checkering on both pistol grip and forend
H (Hellstock) = Low comb stock, no cheekpiece, fullstock configuration
Then, in America, the equivalent models were;
Std = none.
3000 (Crown Grade and Presentation) / 6000 (Imperial Custom) - 600mm barrel, Monte Carlo comb stock with cheek piece, oiled (early) or very shiny plastic varnish (late), french pattern checkering (late) and round plastic (early) or squarish rosewood (late) forend cap
The 3100 is the same rifle but without the high Monte Carlo comb
7000 (Imperial) - High comb (MC) butt with cheek piece, Schannabel, highly figured quality walnut, checkering on both pistol grip and forend, adjustable trigger
4100 - 520mm barrel, schnabel forend, forend checkering, low comb stock with cheekpiece (pretty much the same as Swedish Lyx model)
4000 - Same thing, but with Monte Carlo High Comb.
456 / 458 - version of the same rifle, 456 is the full stock with forend checkering and low comb and cheekpiece, while 458 is the exact same with high Monte Carlo comb and cheekpiece
and the model 5000 or "Husky" which is an American only economy model, 560mm barrel, MC butt forend checkering, schnabel forend.
There are also sight differences betwrrn the high end and the lower end models, and some models were not treated here, only the most common ones.