Buck Lockback Limited Custom #500 1 0f 250 W/Holster

I have been scouring the internet to find another knife like the one I purchased in the early 1980s. I can't find any information or listing for my knife. If you have information regarding value etc., I would appreciate hearing from you.

I never used it and it has been sitting in my drawer for about 30 years.
It would be interesting to see if it has appreciated in value since I bought it and if there are others out there that own one, as well.

Thanks.