I appreciate the comments all.
I don't think I'll finish the collection, but it's been a 35 year quest and I'm not stopping yet. I've never seen any error on a 1909 hit the market, let alone an error on a 1909-S. Of course, I never thought I'd come across an 1877 error, but I got a nice struck through that I like. Not a major error by any means, and a key date with such an error makes it less desirable in many regards, but it's something and I like it. I've also seen an 1877 with a rim clip. And an extremely low grade damaged 1877 5% or so off center error. How that one circulated so long is beyond me. A proportional number of errors to the low mintage no doubt.
I look forward to an error on an 1873 in the next 5 years - I imagine that's next. I know there's a popular variety of that year, super popular and fairly attainable, but I don't count varieties as part of my errors.
Some day I'll put them all together in a photo album.