There still are today two 7yo Weller brands -- W.L. Weller Special Reserve (90 proof) and Old Weller Antique 107 (proof). Both have histories that extend back quite a ways, so I suspect you have a past bottling of one of those. The Antique 107 has also been known as Old Weller 107 Brand and Old Weller Original 107.
The bourbons are the same except for the proof, according to Ken Weber of Buffalo Trace, which now owns the brand. However, your older tax-stamped bottling would have come from the Stitzel-Weller distillery, which has been mothballed since 1992 because of asbestos-related issues. It produced, quite simply, the finest wheat-flavored bourbon since Prohibition. So, if you enjoy fine bourbon, open it.
As to collector value, there is a limited, small market for old bourbons, which were produced in industrial-sized production runs, so are seldom rare, even in older editions, unless an unusual or special bottling. The most accurate statement would be that it is worth what someone is willing to pay you. And that will vary, depending on who happens to be aware of your sale. Try Ebay, if you wish to sell.