We don't allow dirty drums here, sir. You must immediately render them clean. This involves the tedium of a complete tear down and much grease, that of the elbow variety.
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They look almost like a cross between old Yamaha and Pearl. The tom mount on the bass is most certainly the Pearl variety, yet the lugs have a Yammie look about them. My brother had a set of Yammies many years ago, in the 80s, and they looked very similar to those exact drums. I know the name was not the same, and I'm almost certain they were Yamaha. I am going to say they are almost certainly Made In Taiwan, MIT as we xcall them, hence the name. Here they would have a some other cool, kookie, or really lame neam, like George Drums, or Kwick Pace...the inventiveness of the naming during the 80s was wonderful. And yes, they date late 70s to mid 80s, by the overall character they present. More than like they are a lauan shell of some 7-9 ply and similar thickness measured in mm, around 7-9 mm thick, and probably out of the Pearl plant there. They will probably tune easily and well, so spend some time and get intimate with them, tear down to the bone and clean them,Kleening lubricate everytthing and see if the bug bites you, then you will get frustrated and join the community to get the answers life has bothered you with for so long....like, are drums really that cool that people will troll this site for hours learning about them?Yes Sir