What can I sell my Alvarez 12 string for? model # 5021, serial # 46408

Question edited for clarity. They aren't easy to date. See the first link. Ask them direct. Also there are MANY models and you give no clue.

Alvarez guitars - Jedistar

Jedistar https://jedistar.com > alvarez
Serial number appears to have an A before numbers and then 5 digits like yours, 81613. It's stamped into bracing on the back piece, no sticker. Mine is ...

Alvarez Guitars: Home

Alvarez Guitars https://alvarezguitars.com Which guitar gives you unsurpassed value and quality? Which guitar is the one you keep reaching for? We believe that guitar is Alvarez. Why Alvarez. Featured ...

https://www.google.com/search?q=alvarez+serial+number+lookup

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Up to around 2000 the series was split into Regent Standard models with the lower model numbers (RD10, RF20, RD20) and Regent Deluxe models (RD30, RF30, RD50).
Date of Manufacture: 2001

You might try to find out through Google. It may be made in either China or Korea. As long as you quote the number of that model which should be on the inside of the guitar if you look through the hole in the centre of the top of the guitar where the strings run across. Best of luck.

Elixir is a really good string. Have a good sound and last longer than any other string I've used. They aren't cheap ~$15 a set.

That is the model number. It would sell for US$250-350 depending on condition.

in my market, Korean Sigma 12 strings generally sell for $200 if in good shape. However, if the neck is not straight as is common with 12 strings, and cannot be adjust to the proper position, it will be worth less.
Unfortunately Korean Sigma serial numbers are hard to trace. This link may help you- http://www.liquisearch.com/sigma_guitars/history

http://alvarezguitars.com/contact/

they are usually more than helpful...

Anonymous (may I call you Mous?), Alvarez serial # system is not as intuitive as say... Krylic haiku. But, If you are on Facebook, you can PM Alvarez via their FB page. Include a pic if you can, You should get an answer back in 72 hours or less.

You can find out here
http://bluebookofguitarvalues.com/Acoustic_Guitar_Values/Manufacturers/ALVAREZ?id=ALVAREZ

Look on YouTube- there are *many* how-to videos on changing guitar strings.