Praktica 35mm Lab Camera

I have an lab/astro Praktika. I purchased it in around 1980 and it is in excellent like new condition (the case strap has never been opened). It has a removable viewfinder with 2 viewfinders one for normal photography and one for astro. It has mirror lockup and an air bulb extension. I believe this camera was a ripoff of a Miranda Laborec. Does anyone have an idea what this camera might be worth? I can supply pictures. Thanks for any help

Rick H