Hello. Long time lurker, infrequent poster. As the title suggests, I have a question regarding Jasper shells. I have it on good authority that the manufacturer of a small boutique line of snare drums out of California in the early 80s sourced 8-ply shells from Jasper. I have found almost no references to 8-ply Jasper shells. Second, I have a Corder snare I picked up a few years ago and there are references to Corder using Jasper or Keller. At the time I received the snare I noted it does not have 6 plies and assumed it was a Keller shell. Looking back now and comparing the shell on the Corder to the shell on the other boutique snare, the plies look the same. I compared it to an early 80's DW with a 6-ply Keller shell and the construction of the Keller looks completely different. I have been researching for a few weeks now and cannot find much of anything so I am hoping someone here can shed some light. Thank you.