The examples with the viewing holes in the side are mk1 mags (un modified) and without holes mk2. mk1 mags are said to be rarer than mk2 although there does seem to be a few turning up on the surplus market. Looks like you have 3 modified mk1s with the viewing holes filled up with solder/braze. The mag 3rd from right and the far right mag in 2nd picture look like Indian reduced capacity mags (19rnds?).