HHB, they are basically the same as a 3000 crown grade, tucked in a lighter stock. They have the modified HVA mauser action, pot metal bottom guard and floorplate.
Nice light rifles, I believe your era guess to be accurate too.
Just like all the other Huskies they are notorious for the tang crack, be sure the reciever is supported in the stock before shooting it.
If 264Magnum stops by he should be able to tell you age by the serial number too.
I haven't had the lightwieght model you speak of, but both my Crown grade and 1950 high power shot very well.
Hope this helps!
Noel