Types You Can't Pass Up, Even If You Already Have A Few.

@GF, assuming you have ~900 of them, if I add my ~600, together we have cornered approximately 0.0001% of the original mintage. We are just like the Hunt brothers.

Back around 1965-1966, I couldn't pass up any pre-1965 US quarters that came my way in circulation. I managed to grab about 700 of them before they disapeared -- about 300 were dated 1964 alone.

I don't save the circulated ones that still pop up from time to time, but in mid-2009 my work got a couple solid boxes of 2009 LP2 cents and I had to get rolls of cents from the bank to swap them out as fast as I could



(This doesn't include the bag of loose coins I also salvaged.)

I got so many so fast that to this day I still haven't searched them for doubled dies

When I decided to grow my Poland collection 2 years ago, I started with an auction lot of 8 trojaks (3 groat coins) from the reign of Sigismund III. My initial goal was just one from every year 1588-1605, and covering each of the 9 mints, but most year+mint combinations (that would already be 87) also have major and minor varieties each year.
I have mostly managed to resist going down that rabbit hole, but did just broaden out the year 1598 which is the first year of using letter mint marks (4 that year, B, L, F and P) instead of a privy mark.
Still, I am looking at, and bidding on one or two of this type in every auction (unfortunately so are a lot of other collectors). Fortunately I'm not often succesful.