1977 No Mint Appears To Have Proof Like Attributes Or Silver [1977 Quarter]

Looks like a decent strike on this coin,
but that's about it, nothing really out of the ordinary.

Proof-like attributes?

Looks normal.

Definitely a clad coin.

What are the proof like features that you are seeing?

I see a well struck business strike clad quarter.

It kind of feels like you have picked up some random terms, but at least you came here to ask.

" no mint mark" until 1979 (Dollar coins) and 1980 (the rest), the Philadelphia mint did not mark their coins (except for the War Nickels 1942-1945 which was more to denote their silver content vs. place of minting). No mintmark is usually stupid clickbait videos. There are a very, very few cases where the mintmark was accidentally left off PROOF dies used in San Francisco, creating a valuable mint error.

Proof is a type of manufacture. Specially prepared dies and planchets are specially struck to create coins for collectors that showcase the very best the coin can be. Modern coins will have mirror fields (the part that is not the design) and frosted designs (or inverted for the "reverse proof"). Since proof is a manufacturing term, even if the coin is placed in circulation, it's still a proof, but an "impared" proof.

The inverse term is circulation or business strike (or sometimes circulation quality), implying no special care or preparation - the coins are struck to circulate as money.

A clad coin (US, 1965 and later) is created from three metal strips that are mechanically bonded. The common composition is 75% Copper / 25% Nickel (which has a silver color) and a pure copper core. Thus you will see a redish stripe in the middle of the edge like your 3rd photo.

There are SILVER-clad coins. Some are silver bonded to copper (with the stripe) and some are silver bonded to a copper/silver alloy which are harder to separate (weight is usually definitative).

stained, nice business strike.