The original P85 had a design flaw which had the potential to result in an accidental discharge. The Mk II corrected this design flaw.
Ruger has sn data on their web site.
You will need to contact Ruger for a correct answer
You will have to call Ruger to find out.
100-300 USD or so
Go to Ruger's web site and request a manual.
No
25-350 USD or so
75-160 USD or so
100-400 USD depending on condition, accessories, box, manual, etc..
250 USD
if condition is good 4 or 500
50-250 or so