This is a barely-used Thames & Kosmos Chem C3000 chemistry set. It is one of the only chemistry sets on the market that hasn't been "watered down." Most other modern chemistry sets barely deserve the name, and may only contain a few ultra-safe (and ultra-boring) "experiments."
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I bought this set for my kids about 10-15 years ago, but they apparently didn't inherit their Dad's fascination with chemistry, so now you have the opportunity to obtain a premium set at a discount price. I have not gone through to check every item, but a cursory glance suggests it is essentially still complete. There is one empty spot that may have contained a small plastic funnel. Most of the chemicals have never been opened, and the few that have were barely used.
Speaking as a chemist who has worked in industry for over 30 years, I personally recommend this set to anyone who has kids that are interested in learning about chemistry.
Note: This is the original version of the Thames & Kosmos C3000, and comes with 387 experiments. The newer "version 2.0" C3000 sets have only 333 experiments and sell for over $250 on Amazon.