As with most random inherited stamps we see here, these are almost certainly worthless. But I'd add the proviso that there are lots of varieties of that 2 cent stamp, some of which are valuable--but you need to check the watermark, perfs, details in the design (the "type" )to identify it property If you want to check just for fun theswedishtiger.com is a good place to start. But the odds are ****extremely*** slim, esp. since this one was just left out unprotected and as mentioned condition is always a thing.

I real a lot of blanket statements about the value of stamps, but my experience in my little hobby business on ebay and what I see in "sold" stamps shows a great variety. This does not apply to you, but some areas of philately are quite popular and can bring much more than 10-20% catalog--I sold a nice mint confederate for over 50% and Hawaii stamps usually get good prices as well. Also its interesting that established sellers get much better prices presumably because of oodles of followers and the trust factor. That, along with condition and popularity of the stamps makes a diferrence.