In the USA
Ruger, Winchester, Henry, Savage, to name a few.
AFIAK, only Ruger knows. You could try asking at RugerForum.com
Southport Connecticut
You will have to find the ATF data for that year. Ruger will not tell you.
The Deerfield Model 10/22 rifles were manufactured by the Deerfield arms company in the early to mid-1970s. These rifles were based on the popular Ruger 10/22 design but featured specific modifications and branding. Production of the Deerfield Model 10/22 was relatively limited, making them somewhat rare among collectors today.
These Would Be Ruger 10/22 Rifles. They Are Popular Guns and Are Able to Be Customised Widely With Accessories. They Also Are Manufactured in a Number of Different Models.
The Model 77
Ruger is one.
The company Sturm, Ruger & Co was first set up in 1949, when it first began selling its rifles. Since then, it has enjoyed wide success for its popular rifles.
No public data- but you can ask Ruger customer service through their website.
Ruger's website has extensive sn data.
Ruger has sn information on their web site.