Supex 900 Mono Cartridge

I recently took a flyer and bought at auction a Supex SD-900 wood-bodied MONO cartridge. The seller didn't not know much about the cartidge but seemed an earnest individual. I was only one of two bidders and, from the prices some other Supex cartridges have brought, that makes me a little nervous! Do others know something I don't? ;-)

I tried to do some research and can only come up with limited verbage on the SD-900 and I see that a few on this board have used them. Nothing on the mono, though.

Anyone have any pearls of wisodom to share with respect to this cartridge - even if it just to say that I've ventured into a $111 boondoggle?!