Awesome, then that's the SP set. It ends in 22 hours (though since it's a Buy It Now and not an auction, it COULD get relisted). Anybody wanna buy it?
Toho Kingdom has a picture of the Anchor Bay Megalon tape, there is no R&G Video logo on the back, so I'm presuming it is NOT the uncut video master New World licensed at the same time as Gigan and Mechagodzilla, but chose not to release due to the market already being flooded with inferior-quality unlicensed copies. They claim it is the same edited version, and that it starts with a logo for Burbank Video?!
Their scan of the Burbank box says "Duplicated in SP Mode" on the back (unlike some copies I'm finding on eBay, which have smaller tape spools and no such message on the back of the box). If the Anchor Bay version was indeed recycled from the Burbank release, maybe it'd be easier to track down an SP Burbank copy.
Here's a Burbank copy the seller claims to be SP:
http://www.ebay.com/itm/Godzilla-vs-Megalon-VHS-SP-Mode-/351514390348