Please Help Me Evaluate A P08 Luger Pistol

[Puma357]

I have inherited a P08 Luger. It's a 1918 Erfurt with all serial numbers (with possibly 1 exception) matching. It went into police service at some point. It has 1 matching magazine, no holster, and no tool. I wish to learn market value, not for selling it, as it is a family heirloom, but for equitable division of the estate among the siblings. Thanks in advance for any helpful valuation information you may provide.