In the 60's-70's there were three main manufacturers of MIJ stencil drums Pearl, Star, & Hoshino. Hoshino is the least documented of the three, but we do know that their official name was Hoshino Kougyou and in no way related to Hoshino Gakki, who was the parent company of Star/Tama. There were two smaller companies who also made the stencil drums, Sakae & Yamamoto Drums (Gracy). Sakae had better hardware and diecast hoops, but all five had lesser quality shells in the beginning. The Zim-Gar brand for a while used Sakae (as well as Star). If anyone is guilty of using someone else's lugs, it would be Hoshino, whose Slingerland style tom lugs are identical to Star. Pearl's lugs are slightly different.
They are all guilty of stenciling from SONOR too. SONOR was the only company that sued and was willing to go bankrupt doing so. They almost did. They also could not win. That's how bad it got. The cheap swingers, rockers, and other kits from the early seventies minus the Champion series is a direct result of going for broke protecting their brand. No US drum company would do it. Even though all the drums were marketed in the US from Japan.
Hoshino, Pearl, Star, can Sakae my stick for all I care.