Gustav V,15, 20 Ore 1921 (Violet

I inherited my grandfather's stamp collection twenty year's ago and started looking through them recently and found these but am confused are these worth anything?

Well, they're worth 0.02 or 0.05 €, if you find a buyer... Which is hard, as most Swedish stamps collectors (like myself) already have them.
Better, keep the stamps and pass to your children.

The stamps you show are mostly in the 1920-40 range and most have minimal value.
However, this period is loaded with all types of varieties some of which do have very good value.
It is unlikely that you have some of these high value items.
You would need to really get involved, obtain a watermark detector, an accurate perforation gauge and a specialized catalog - a complicated endeavor that may not produce much results - welcome to stamp collecting

Out of curiosity, is there a reason you singled these ones out, from the whole collection, to ask about?