It looks like the range of prices in value for it could be anywhere from around $6.50 for being somewhat circulated and up to $15.00 for uncirculated. I would guess maybe about $8.00 - $9.00 for yours based upon what you have described. However, it would be best for someone to actually be able to see it to give you a fair evaluation. So, I would suggest taking it to a coin shop.
Age isn't necessarily the determining factor in the numismatic value of silver certificates. How many of them were printed also comes into play. The rarer they are the better.
The information on the following sites might also be helpful to you.
Ron's Paper Money FAQ sammler.com: Values of Silver and Gold Certificates 1928 -1953 Silver Certificate - Wikipedia, the free encyclopedia
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