@Susuman, currently up to 23 holes filled:
LWC,
LMC, 2 cent piece,
V nickel with CENTS, both types of
Buffalo nickels,
War Nickel, silver
Roosevelt dime,
Barber quarter, both
Standing Liberty quarters, both
Washington quarters, Walker half,
Franklin half, both
Kennedy halves,
Morgan dollar,
Ike dollar, bicentennial quarter and dollar,
SBA dollar, and
State Quarter.
There are a few other coins I could add; some have been misplaced for the last few months (or years), and in some (mostly modern) cases I'm not sure how to select the example.
Provenance:
LWC and Ike ex @jeffrose (but I did buy some lesser quality wheats), 2 cent ex Secret Santa (forgot the gifter's name), type 2 SLQ ex you (
SBA maybe too, I forgot).
The Morgan was sent to me last year by a CCF member, again, I forgot the name. The silver Washington was a CCF contest prize a few months ago. I have no idea where the clad Kennedy is from (possibly my father's collection).
I've never bought a
State Quarter, but I did get several
State Quarter lots (including, IIRC, one full 50 state set) from assorted friends and relatives, so I'm not sure which particular lot this one is from.
The
LMC and silver Roosevelt were bought in Kaliningrad; so might have been the silver Kennedy, don't really recall. Rest are from various Moscow shops and markets (but some of the pieces I could add to it weren't).
And here are four American coins I bought that are
not in my 7070 - and one that is...

I bought this 1923-S
Peace dollar for 800 rubles at an antique shop. In retrospect, this might have been a bit overpriced; if that's any consolation, it was labeled 1921, and I didn't discover the actual date until after buying it.
(I didn't discover the S mintmark until a year later. Can you see it too? It's about 8 o'clock on the second photo.)
Admittedly, the 800 ruble price came out to under spot on the day I bought the darn thing... April 27, 2011.
Wasn't quite the case on almost any
other day... at least, until December 2014, when the exchange rate went way up. Not quite true today either - but pretty darn close!
This will probably go into my 7070 the moment I find it... hopefully this year. I swear I've seen it recently.
Fun fact: until I got the Morgan in 2017, this was my only US silver dollar.

Perhaps the jewel of my collection, this large cent was bought at the same antique shop as the above - for 1000 rubles (~$35 at the time).
There are some rim bumps, which are hard to see on the photos. I suspect that a
TPG would have graded it something along the lines of "VF details". Still not exactly an easy to find type... in Moscow coin shops, anyway.
I have another large cent, ex nice CCF member, which is destined for my 7070... when I actually find the darn thing. Hadn't seen it since at least 2015, if not earlier.

This little group photo from January 2014, and
the CCF thread that came with it, are the only evidence I have of buying this
V nickel. Can you guess the date?
(@Susuman: bought at the same place you got the 1931-S from, just a few years earlier and for 200 rubles.)
I hadn't seen the coin itself since 2015 or so; or, at least, I wasn't able to find it for
my first CCF anniversary contest in 2016 - go participate in it, by the way, it's technically still going on, just inactive as ch*rp - and hadn't seen it anywhere after that either.
I sure know where the LRBs from that pic are though! (...I think. But I've definitely seen them this year.) Really should go and photograph them individually.

This coin - the one in this batch that
is in my 7070 - is a nice example of buying from places that don't know what they have.
Yes, it's an 1901-O
Barber quarter. Yes, I'm pretty sure that's a semi-key date. Yes, that's damage on the L in DOLLAR. No, it's not actually purple, that's an artifact of how I photographed it.
I also paid 200 rubles for it. And that was in 2017, so 200 rubles means about $3.5 (or just barely over spot).

I know there's not much to look at. I knew that when I bought it. It only cost 50 rubles though... well, 100 with shipping.
Yes, shipping. You are looking at the only coin I ever purchased online so far.
I have it listed on Numista as 1823, because this is the date I thought I saw on it.
I doubt that this is its actual date, though, so most of my other records say something along the lines of "dateless 1816-36".
Also that Meshok place... darn. I'm looking at a harshly cleaned dateless Classic Head cent (similar in condition to the Matron Head above... OK, better on peripheral devices, though I think it's still dateless), and seriously wondering if I should ask my mother to give me the $8 (OK, $10 with shipping) I'd need to pay for it.
Because this might well be my only chance to get this type anytime soon (even there, I suspect).
...If it's still up in the morning I'll ask directly.
[EDIT: fixed a particularly unfortunate typo]