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book learnin' question

I am looking to collect world coins from a specific year - 1973. Should I buy the newest version of the standard catalog, or can I get away with an older - say 1993?
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buy the coins. You're likely going to be put off by the prices you see
otherwise. Be very careful with what you pay for this stuff since the
catalog usually lists too low but in some cases it's way too high. Grade
conservatively and remember if a coin isn't obviously unc then it won't
sell as an unc. Modern buyers tend to be pretty picky about grading.
If you're just pulling stuff out of circulation or from poundage then an
older reference should be OK.
Linky
1/2 Cents
U.S. Revenue Stamps
Goto Find My Coin, Select World in the drop down and put 1973 as a year
Hope this helps