The supplier I got my H. spinifer from in the Cameron Highlands, took a photograph of a two-tailed Hetrometrus he collected in the wild. The photo was sold as a postcard in his trinket shop. I bought a copy and had it on my wall for the longest time. I never posted it due to the fact it was not mine and I never questioned if it might have been a photoshop job. I'm no expert in photo analysis, but this photo represents a possible novelty that I hope to see in the flesh someday...
Due to the glossy finish of the postcard, I had a difficult time scanning it. Instead, I took a picture of the post card with my Logitech webcam.

Master JeromeKoojiman at the infamous Venom List aged this specimen to be approximately 4th to 5th instar. The supplier also mentioned that he has encountered this mutation 7 times in his countless forays out into the jungle, so my guess is that these mutations are more frequent in nature than many of us would imagine.
Cheers.... I'm not crazy guys.... lol
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"We are the Swarm... the Relentless Tides of Devastation Sweeping Across the Stars... the Eater of Worlds... We are the Swarm...."