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1188:

Sorry misunderstood ya for a second... you can try to press it... there are three types of presses... a wet press... a heat press... and a dry press

I would recommend a dry press.... place said note in the middle of the pages of a really thick book. Then stack some heavy things on top of the book and leave it for 2 -3 years. This works well with paper notes and you can usually improve by 1/2 grade... With poly's I'm totally unsure... I have a few 50's RADARs and SNR's that I am pressing but I don't know how the poly paper will remain intact ... my hopes are not as high.

@ nala: If you like words in serials, you should check out Canadian $5 and $10 also. You can find APE, APT, HAD, FEE... At one point I thought of collecting just all the words with radars and keeping the finest examples, so there are quite a few out there to make it fun. Collecting currency, though, gets expensive.