I know a little so I will start a reply...
When you swing open the cylinder you will see where S&W put their Model number and revision on more modern S&W revolvers (post 1950's I think? Someone will be along to correct that.)
In your first example, you have a Model 10-7, a "K" frame in 38 special. That is what that "38 special ctg" means, the "ctg" stands for "cartridge." That "4D" number is probably the serial number. The "-7" means that is the 7th version, indicating that there were prior engineering changes. There were a jillion Model 10's made, they are somewhat common and a terrific, well-made revolver.
S&W publishes a catalog that lists serial number ranges and associated manufacturing dates. Many folks here have it and will likely chime in with some additional information for you.
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Marty 4513TSW 13-1 642 60-10
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