Go to CAROLINA dot com and look at Model #566793C for $933... This is a SOMSO model VERY similar to mine, perhaps exact. Mine has 8 removable brain sections PLUS artery, total of 9 removable parts.  Dusty but in excellent condition,, yes I am a Doctor and have owned this sample since school,, 40 years ago. I believe there is a 4 section on Ebay for $250..