The specs are from the original in 1980- when SEAS made a complete speaker, cabinet and all. The rebuilds are like Abe Lincoln’s axe at this point- different head, different handle…
After 40 years, only the upper bass driver is still in production. The woofer, upper midrange, and tweeter are all best attempts at replicating the Thiele/Small parameters of the original drivers. Brian at Madisound was quite helpful in this regard. I was able to contact SEAS Norway via email and they sent me pdf specs of the cabinets, drivers, and crossovers. The crossover diagrams were helpful to Scott at SG Custom Sound who rebuilt the crossovers.
I realized after I posted this that there is no way I can do an accurate measurement- nor, it seems, is a definitive way of measuring observed by manufacturers.
I’m excited to hear what has transpired- my friend is refinishing the cabinets, so this could take a while.