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Avengers 1, by a clear margin, ties with Daredevil #1 as the most common of the Marvel mega-keys from the early-mid 1960s.
Iron Man (gold version), Hulk, Thor, Ant-Man and Wasp... That truly distinctive cover with the green Loki costume and the red banner, box and Thor's red cloak. It's a classic.
If you're serious about collecting Marvels, then you really ought to own one of these. It turns out that a copy of Avengers #1 is a great investment too.
An easy book to recommend, but not so easy to pick a 'perfect' grade to invest in.
General notes about this issue: the spine shows wear, a lot, because the green of Loki's costume runs right down the length of it.
The red on the front is very prone to fading, so try to avoid any copy that looks more orangey than deep 'fire engine' red.
We see less Marvel chipping on this issue than some of the other keys.
What Can You Afford?
As with other Marvel mega-keys, your budget is the probable best starting point. Entry-level is over $500 for any ragged copy now. Naturally, the way your copy looks ("eye appeal") will affect your ability to sell it to a new owner one day.
If you're buying at the low end of the market, then you need to consider eye appeal very carefully. There is a world of difference between different low-grade comic books of the same grade.
A Silver Age book can be a 0.5 if it has half the front cover missing. It can be a 0.5 if the spine is split and held together by tape. It can be a 0.5 if it looks like it was used to start a bonfire, or if it was used to mop up a defrosted freezer.
A 0.5 can actually be reasonably presentable too. The same goes for 1.0, 1.5, 1.8 and 2.0.
Beyond 2.0, you ought to be at the very least buying a book with nothing major missing. Ideally the front cover will be less damaged than the back.
4.0 is about the level when a Silver Age book really starts looking decent. Many investors won't dip below 6.0. Beyond that, asking prices start to get expensive.
Here are recent sales. I will give my recommendation afterwards.
I'm going to presume you can't afford to drop $10K+ on a single comic book.
CGC 4.0 is my pick of the bunch. This has appreciated 25 percent per year for the past two years. Buy more than one if you can afford to.
You could buy four copies in 4.0 for the same price as one CGC 8.0.
When it's time to sell, you will have less trouble finding a buyer at $3K for a 4.0 than $12K for an 8.0, and you can offset the cost of the other copy or copies by taking a profit on one or more of the lower-grade ones.
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