Those 4" Model 25-5s are popular and not easy to find. Yours is Magnaported which hurts collector value but makes it more pleasant to shoot. I would think it's worth between $900 and $1200 depending on how you sell it. Personally that would be a keeper for me.
To my knowledge Smith Wesson never magna ported any .45 LC at the factory so Its most likely after market which hurts the value. The other thing that hurts the value is the fact tha .45 LC does not need to be ported unless they are shooting vert hot rounds. That in the long run would hurt the but loosening it. From the perspective of the gun being of any collector value is nil it a shooter all the way but how much shooting life is left is the questions if hot loads were used !!! Just my thoughts