66+ Full Head. A very nice coin, would probably be a 67 except for the marks on the reverse. It has a very strong strike with the full head and rivets in the shield. Love it!
I don't see where the AU folks are seeing any wear, but if there is any, I'd say AU-58+ and a coin I'd take over any MS-60, 61, or 62.
The only Standing Liberty Quarter I have, is m 2016 Gold Standing Liberty Quarter. I wouldn't trade my gold for one like yours, but I would like to find one within my budget. Any background available on your SLQ?.