I caught these two auctions on eBay, both from the same seller, "cards.and.decks" from Kuala Lumpur, Malaysia:
This is for "Bicycle Big Gun War Series Playing Cards Red & Blue Deck w/ Vintage Tax Stamp"
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=251212652536This is for "Tally Ho Deck Red & Blue Circle Back Playing Cards w/1960 Vintage Tax Stamp Seal"
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=251210957986Both decks are cellophane sealed; the Big Guns have a "Bicycle" clear tear strip with red lettering while the Tally Ho decks have a solid red tear strip. They look awfully new for vintage decks, so I did a little digging.
The tax stamp on these decks isn't circa 1940-1965, as the seller claims, but is in fact from 1924-1929. For the Big Gun decks, that's a big problem - authentic Big Guns were made and sold in just one year, 1918, and only for a few months. It's one of the shortest print runs of a USPC deck ever made, and they're insanely valuable (when they're the real deal and not reprints from 2011, which these appear to be)! It doesn't bode well for the Tally Ho decks either - if we're to believe the seller on their stated time frame, these decks have the wrong tax stamp. If we're to believe the tax stamp, the decks are way too new and decks of that era didn't have cellophane, am I right? They were usually sealed shut with the tax stamp, and the cards were paper-wrapped and wax-sealed.
Perhaps you're wondering about those too-old tax stamps? Well, I've spotted sites online that sell tax stamps from decks. There are people who buy them like postage stamps, as part of a niche philately market. It's like a deck collector who only buys Bicycle, or only buys joker swap cards... The stamps are usually pretty cheap, certainly cheap enough to make back the money on a sale this costly with modern decks.
tl; dr: don't buy jackshit from cards.and.decks on eBay. They're either totally clueless or not to be trusted.