It's a Tradewinds thing.
Their models included ;

**** All North American models have 1" sling swivels.

Short barelled (520mm)

4000 Lightweight Sporter
- Selected walnut Monte Carlo schnabel stock with cheekrest, checkered pistol grip and forend

4100 Lightweight Monte-Carlo
- Selected walnut straight comb schnabel with cheekrest, checkered pistol grip and forend

456 Fullstock Sporter
- Selected walnut straight comb fullstock with cheekrest, checkered pistol grip and forend

458 Fullstock Monte-Carlo
- Selected walnut Monte Carlo fullstock with cheekrest, checkered pistol grip and forend

7000 IMPERIAL Lightweight Monte-Carlo
- Selected walnut Monte Carlo schnabel stock with cheekrest, checkered pistol grip and forend, pistol grip cap, adjustable trigger, high lustre finish

Medium barreled (560mm)

Husky / H-5000 (N-A) - MC Schnabel Stock, Walnut, Chekering on pistol grip and forend pistol grip cap. Usually stamped "Tradewinds" "H-5000" some are merked "Husky" and "HVA Action" - Budget rifle

Long barreld (600mm)

3000 Crown Grade

• • Early - Dark walnut, MC Stock with cheekrest, checkered pistol grip and forend, round plastic nose end, pistol grip cap, checkered butt - AKA "Super Grade"
  • Late; French walnut, high lustre MC Stock with cheekrest, checkered pistol grip and forend, no pistol grip cap, squarish rosewood nose end, checkered butt - Both types have jeweled bolts

3000 Presentation

• • Early - Selected Dark walnut, MC Stock with cheekrest, checkered pistol grip and forend, rosewood pistol grip cap, round plastic nose end, with or without checkered butt
  • Late; Selected French walnut, high lustre MC Stock with cheekrest, checkered pistol grip and forend, rosewood pistol grip cap, squarish rosewood nose end, with or without checkered butt - Both types have jeweled bolts, Stamped "PRESENTATION" on the barrel, engraved receiver and buttplate, adjustable trigger

3100 Crown Sporter

• • Early - Dark walnut, Straight Comb stock with cheekrest, checkered pistol grip and forend, pistol grip cap, round plastic nose end - AKA "Deluxe Grade"
  • Late; French walnut, high lustre Straight Comb Stock with cheekrest, checkered pistol grip and forend, pistol grip cap, squarish rosewood nose end - Both types have jeweled bolts - Few sold

6000 Imperial Custom

• • Early - Selected Dark walnut, MC Stock with cheekrest, checkered pistol grip and forend, no pistol grip cap, round plastic nose end
  • Late; Selected French walnut, high lustre MC Stock with cheekrest, checkered pistol grip and forend, no pistol grip cap, squarish rosewood nose end, checkered butt - Both types have jeweled bolts, Stamped "IMPERIAL" on the barrel, three leaf rear sight, adjustable trigger

Norrahammar
- Walnut stock, Straight Comb, checkered pistol grip and forend, pistol grip cap, round fore end,

Norma Magnum Models (650mm barrels)

1651
- Offered with MC stock, Schnabel fore end or rosewood tip.

HVA Models "equivalents" (Sweden)

For the 1640 - series (600mm barrels)
Standard,
1640 MC,
1640 Special
1640 Lyx
1740/2100
1640K

For the 1600 series (520mm barrels)
1600 Std
1600 H (Hellstock)
1600 Special
1600 Lyx

1651 (650mm barrels)
1651
1651 Special
1651 Lyx

Now, all these rifles have 3/4" sling swivels.

Hope that helps your comprehension, and I did not even touch the 640 / "Hi-Power" / 1000 / 1100 "Super Grade" etc thing...

 

You can add the JC Higgins 51L and the Smith and Wesson model A to the list of rebranded imports

 

That's really helpful, Baribal. Thanks for your efforts. It looks, from your summary, that only the 3000 Presentation, H5000, and 6000 Imperial Custom had anything identifying the model stamped on the rifle. Is that the case? As for the Swedish models, did any of them have "1640" or "1600" stamped on them? If not, how were the various models identified for customers?

 

Yes ans nope...

 

As for your question about the 1600 / 1640 they were just called like such;
1640 serien Special
or
1600 serien Lyx
or
1600 serien med helstock
etc...