What is my Baldwin L series - satin ebony- serial #357709 worth?

I found this Shirley. Look in the knee area.

What model is this Baldwin organ?

https://organforum.com > forum > electronic-organs-midi
Sept 8, 2012 - look under the keybed where your knees are when playing the organ,there is usually a tag under there with the model and serial number,if not ...
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What model of Baldwin is this organ?

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You did not state model, Check the attached links,for your model.
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http://www.pianoworld.com/baldwin.htm

Free Piano Age Research

Baldwin Piano Age

Baldwin Pianos Company History Serial Number Search

This is something that can only be given in person as we can't see the items condition, play it or hear it.

http://www.total-piano-care.com/ try this site to get the information for your piano

Your piano was made in 1946. Here's a link to the age/serial number list
How Old Baldwin Piano World

Your piano was made in 1952. It's current value will depend on it's condition and your local market.

Here is a good place to determine value and history. Baldwin Pianos Company History Serial Number Search

Your guitar was made at the
Nashville Plant, TN, USA
April 21st, 1999
Production Number: 107

you must see someone professional none will know the price just like this specially for free