This will be interesting. I've seen prices from $1000 to $10,000. The 10K one was SN 001. In the condition of yours, I'd expect $2K to $4K, if you've got the lower pulley a bit more. Of course, intake manifold mounts or a Latham Manifold could raise the price. Yours looks to be in excellent condition. Movin/on
Forgot to add, there is a thread I started a few years ago. Latham Supercharger's: Info and Pictures. A lot of info there. Movin/on