I'm confused here... as usual. There were 2.6 BILLION made that year(PA mint)! What else. Be more specific about what you want to ask please. CHEERS Mate!!
Many coins of all denominations minted at Philadelphia do not have a mint mark. Since you are only showing an obverse photo of your 64 did you check the reverse for a mint mark?
It's not unreasonable for your nickel to be very clean. Sets are broken up and put into circulation on a regular basis. If you like the nickel, then put it away in a flip or an album to enjoy. There looks to be one or two steps there out of 6 possible, that doesn't qualify for a FS designation. Not to mention the steps cannot have any contact that breaks the continuity of them.
Of all the nickels I've seen, this is definitely one of them. Especially a '64, I find those way too often, I bet with the high mintage nice examples from this year aren't too hard to find. That's just a guess however, I only keep 40's nickels and earlier after I fill out the rest of my pre-61 folder. That said, thanks for posting and learning more from this website! As others have said, buying a Red Book is the best thing you can do to learn about your coins. You can learn to approximate the grade and value of your coin, and there are varieties listed as well. Reading up and asking questions on forums such as this are the best way to gain experience in my experience.
My take on the subject. Nice pictures by the way... The 64 mint sets were made in quantity comparatively and many were cracked out for the silver. The nickel and cent went into the change jar to be spent.
Read as much as you can about the mint and entire process so you are informed and can answer most of the common questions yourself. When you can't find an answer, post your question here for answers. https://www.usmint.gov/learn/collecting-basics/mint-marks Image Mark Mint Dates of Operation P Philadelphia, PA 1793-present Most coins from Philadelphia have no mark C Charlotte, NC 1838-1861 (gold coins only) D Dahlonega, GA 1838-1861 (gold coins only) O New Orleans, LA 1838-1861; 1879-1909 S San Francisco, CA 1854-1955; 1968-present CC Carson City, NV 1870-1893 D Denver, CO 1906-present W West Point, NY 1976-present (collector coins only) Hope this helps.