NOS speedometer; what's it worth?

[GNTIM]

I believe I got this from NOS4GN several years ago. Thanks in advance

 

[TURBOTIMMER]

What's it fit? Doesn't look like a turbo regal speedo.

 

[GNTIM]

I did a little research and supposedly it is a direct replacement but was originally for a Riviera

 

[TRICKSIXPA]

It looks like it would fit. I would normally say its only worth what someone will pay you. Price I would think about $400 maybe.