Yes
Compare markings, caliber and appearance to the catalogue of DEs.
Just the serial number is not enough to tell who or what you have.
model number is always smaller than serial
Usually by the serial number. If no serial number, then by features
No way to tell from a serial number only.
No way to tell just by the serial number.
Not as easy as it is to call Yamaha with your serial number and have them tell you exactly what it is.
The serial number will equate to a year.
If serial number data has been published, yes.
No way to tell. Sorry, but a serial number alone usually does not tell us much.
You can not tell the model number with just the serial number.
Serial number