In order to keep it simple, all drumsets made by Star can be put into just four different groups, to be distinguished by the shape of the lugs (please note: Ive named the lugs according to the original Star spare part codes, listed in the respective catalogues from that time):
Lug Type 920 Appearing at the very first Star drums, this type was used throughout all times of Star drums production.
Lug Type 924 Added to some drums at the end of the 60s, and appearing until the end of the Star drums era.
Lug Type 6370 Coming up first in the early 70s until the end of Star. These lugs continued also on some of the very early TAMA drums for a short period of time.
All this lugs were placed either straight or offset (sometimes also called staggered) to the shells of rack toms or snare drums. Especially because these vintage rack toms and snare drums are mainly shallow in height, Star had to place the lugs offset. In some cases even the lugs at the bass drums were placed in the offset style, but such bass drums are rare to find.
But there was also another type possible:
Lug Type 921 Center lugs for bass drums and toms, appearing in the 60s at drumsets as well.