Ruger has manuals you can download for free. If that doesn't help you, find a gunsmith. The Mark 1, while not diffcult to reassemble, does require you to "feel" for one part as it engages. It is hard to describe, but, the owner's manual does a good job.
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You can request an owner's manual for free on Ruger's web site.
50-200 USD
You can request a owner's manual at the Ruger website.
75-260 or so
50-175 USD
Which one?...The Mark 1's and Mark 2's are pretty valuable...
Ruger will tell you if you phone customer service.
Go to Ruger's website. They have a sn look up section.
160 or so
That would be 1973. They stopped production in 1982 - going to the Mark II.
50-250 USD or so
If you are seeking date of manufacture, contact Ruger through their website. Values depend on condition- anywhere from $100-300.