R_P wrote
The two things I wouldn't recommend to anyone are:
Lawson-Bouey X notes
test notes (all denoms and issues)
I don't see huge potential for $50 or $100 X notes but I would definitely put my money on:
L/B $1.00 AAX, EAX or AXA (even the C/B EXA) as well as the very popular $2.00 ABX (both signatures & esp C/B) I would say definitely go for the X notes (esp if R_P is advising against it!
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We've seen $1 and $2 test notes take a bit of beating...but I wouldn't give up on them entirely. In fact, if they are a bit low in price right now than I would snap any higher grades you can find! There will always be new collectors arriving on the scene, and test notes are VERY significant... a heck of a lot more collectible than the common insert replacements we see today! L/B RS $5 test will cost you $1000 in VG! and I don't think they're going to soften. They're a lot scarcer than we think. Don't forget that there's several replacement prefixes and often only 1 test prefix. In the 1954 you cannot go wrong if you can get your hands on a G/R or E/R test note (any condition). The 70's test notes are the last of their kind. (Incidently it always amazes me the way some will blow large coin over an insert range when there's so many identifiable rarer notes available!). However I wouldn't be too excited over a 1979 (#33) test though its almost as pricey as the 1972 version.
I think some of the Birds are worth having: I can't say I understand the furor over the coloured BPN for the $5.00 but I wouldn't mind getting any Crow Bouey ENX or B/T FNX. Also significant is the $10 Bonin Thiessen ATX (completely undervalued with 64000 printed & seldom seen) the T/C BDH (rarely offered). The $20 do seem awfully common (and hard to get worked up over!)
I would never pay the price they want for an insert range note (either today's or the Birds). Sinking some of that $1000 in a $10 BEL or 2003 $10 BER couldn't hurt (if you could find one). These notes are extremely rare and no coin dealer needs to go blind searching INSERT ranges to see if the prefix is indeed uncommon.
Obviously any of the 1954 replacements or DF's (esp the short run prefixes) are good investments in high grades. I think the Beattie/Coyne's *asterisk replacement notes are all undervalued in Charlton & will significantly rise next issue. Its rare to see some of the $5, $10 and $20 * notes. Dominion and 1935's are always going up. The Osborne 1937 are always a good investment too.
Cutting, serial number, and ghost errors are ever popular, as are any significant LOW #, million #, solid and 2 digit radars.
Good luck with that cash... Oh how I wish I had a good lump sum to blow!