It's AG. With a TPG it may get lenient grading and on a good day get a G-4 simply because it's a 16-D, but that coin is AG-3, IMHO.
Mike, Take a look at this and tell me what you think: http://www.pcgs.com/photograde/#/Mercury/Grades
I think that it looks like the AG-3 coin in that guide as well. Look at the reverse. Now look at the rims. The coin that Matt posted has only one place where you can see the rim and that's at 6 o'clock. In the PCGS guide, the G-4 has rims that can be seen at several places around the clock. There is very little difference between G-4 and AG-3. Like I originally said, a TPG may bump it to G-4. I think that the pictures say otherwise. It doesn't have enough rims to make G-4 IMHO. Sorry, but that's still my opinion, Mike.
You'd better hope and pray she doesn't read your post Doug, or you may get a head start on your quest for a third wife!
By wear it is clearly an AG-3 at best. I believe it will grade G-6 because it is a 16-D. I don't think it is likely, but I would not be horribly surprised if it came back as a VG-8. I have seen a LOT of seriously overgraded 16-D dimes in the top two TPG holders. (I have seen "VG-8" 16-D's with reverses like this one.)
It's actually an AG-3 because the rims are worn into the lettering on the reverse, but that is now considered Good on a key date, it might even market grade at Good-6. It's sort of like a VF buffalo nickel, standards change on the horn needed over time.... These grading companies have a finite number of coins worth slabbing, thus a need to keep the same coins coming back for a new holder, maybe a * or a Plus or a prong, hologram or some other BS. Slabs are not really airtight ( and they used to rattle). I expect they will come out with something like airtight slabs filled with an inert gas like nitrogen, then in a few years it will become sealed in a vacuum, then a few years later an RFID chip will added to the 23rd generation holders, then maybe waterproof slabs good to 100 meters in case your house gets hit by a tsunami in Colorado. There are only so many AG-VG 1916-d dimes to grade ( really authenticate more than grade). Way too many coins have probably been submitted 10+ times already. I'm old, I remember the days when you got a photograph with the coin ( Anacs, I think) back in the 80's. You couldn't really switch the coin, but it could be damaged since it wasn't sealed in a case....I'm trying to recall Carson as Carmac the Magnificent.....hermetically sealed envelope on some granny's porch since noon yesterday, yada, yada yada, as he held the envelope to his forehead. You don't regrade a slider Good 1916-D dime ten times, just authenticate it once, and it's done. These grading services are kind of pond scum. No need to grade stuff like ASE's , either. Well once all the old coins are graded, then what's left ?
G04 is my guess due to slight rim wear on reverse. Obverse looks G06 though, but I've seen ones exactly like the one you have grade G04, sorry to say. -Brian