Thanks Dearborn - no, didn't pay much - and to be honest, I'd prefer to have a bit of a mystery on my hands than a low value hohum poor condition DBLE dollar that I'd stick in an album somewhere & forget about...
Sure, this may be some cheap modern fake, but I really don't think so - too much is correct as far as I can tell - weight, size, 'ring', edge lettering & the reverse is totally genuine IMHO - it's the obverse that's so darn squinty - date is weird, although correct for at least a few of the close date varieties, but the stars & LIBERTY are not right either (although nothing very wrong there, just don't match any obverse dies I can see). If it's a counterfeit of the era, or indeed the last century, then that's fascinating in and of itself - if it's a basically genuine dollar that's been altered or repaired (as per the speculation of westernsky), then why did anyone go to the trouble?!?
Anyhow, thanks for those who took the trouble to take a look & give feedback - I know I don't post much, but I love this site & community.