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On the breach under the barel
1970
1959
about 1875
After 1978.
Many early ones may not have a serial number. If they do, it will most likely be on the side of the receiver. There is a small chance it will be inside, after you remove the barrel.
What year was riverside, 12 gauge, single shot ,model 548 made
Impossible to answer. Serial numbers are not unique to only one firearm, and there is no single database of ALL firearm serial numbers.
No serial number provide; 50-850 USD
1958
If the Ruger website is up, it has sn data
No published sn data.