There are not enough of those around, the DP45F, specifically, to establish a "market value", so there really can be no answer to your question. In the end, I think your unit would sell faster than a unit that is sold with no guarantee of condition, but not necessarily for much more money. In the hierarchy of the Denon DD turntables of that era, so far as I know, the higher the DP#, the better, with the very rare Japanese only DP100 being at the top of the heap and worth around $5K, if you can find one. The lesser products that were exported include the DP80, 75, 62 (and variants), 59 (and variants), and I think also 52. If I haven't missed any, then after that comes the DP45. Its value is stuck at a certain price point and in relationship to that of the others. But only the marketplace can tell you what that is.
I continue to hang on to my DP80, because it is not valuable enough (according to the marketplace) in relation to its greatness as a turntable, as I perceive it. So, why sell it?