"Officially Sealed" Stamps
This is a block if 12 stamps that say "Post Office Department - Officially Sealed". I wondered if the stamps are still in use and if not, when were they discontinued. I did some looking around and found out that there were several styles, many very similar, but I don't know which mine are. They are in good condition, although some of the perforations have been compromised. Any value to a collector?