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Yeah OK it is not a 7 day set per se, but cleaned and honed they would sell for more than 21 each. Even for just no frills shavers you can get 35$, and one or 2 look like they could be worth more....

I just stumbled upon this
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&ssPageName=STRK:MEWAX:IT&item=120216238200&_trksid=p3984.cWAT.m240.lVI

Ok it's not a treasure (if they were JR I would have...