A Little Help Please... Double Faced Stamp?

I was recently going through my grandfather's collection and found an odd stamp from the UK. It 's a King George VI A101 2P on one side and a (reversed) King George VI A101 1/2P on the other. Is this rare? I can't seem to find any mention of it in the Scott Catalog. Any help would be greatly appreciated.

The stamp has two different denominations. Could they be to different stamps stuck together?

That's what I thought at first. But it's a single stamp.

The margins of the green side are almost the same green color as the design. To me, this makes it look like the back side is discolored. Is the stamp really thin?

Nope. It's not any thicker or thinner than other similar stamps. My scanning app on my iphone may have skewed the colors a bit. I can do better scans on a real scanner if it will help.

That's neat.

Is the green side shiny at all? With gun ?

Looks like a transfer from one stamp to the gummed back of another as the green 1/2p is reversed.

To my unexpert eyes the colours look to be the frist or second printing of this series. Measure the perfs, 1st printing should be 15 x 14 and scond should be 14-1/2 x 14. Watermark is the same, although an inverted watermark would be worth $75 instead of 75c.

It is , as far as I know, an oddity only. The green was probably transferred to the gum of the orange by being in a heated, pressed situation, like someone's wallet in their back pocket or something of the sort, and over a time period too.

That guess is because to be a real postal mistake transffer, a kiss print as it is sometimes called, the back colour would have to be orange also as all the same colour stamps would be printed at the same time.

That's pretty impressive, no pun intended. I wonder if it could be an image transfer from when the stamps were stacked wet off the printer, but the transfer is VERY complete, and a different denomination would mean a separate print run. Quite the oddity. A keeper for sure.

The back isn't shiny. It doesn't look like it was ever gummed. Here are some better scans. They're not particularly sharp but the colors are more accurate.

A great oddity to say the least Lumpy. I wish I had an answer for these, but, I don't.

Chimo

Bujutsu

I believe that the one side has been reperfed. I wonder why?

Theory:

Man soaks some stamps, possibly in hotter water than was necessary. He places the stamps in the drying book or between blotting paper but two stamps get stuck together either accidentally or not.
Large amounts of heavy books are placed on top to keep the stamps flat.
Then the transfer takes place, albeit a pretty good one.
This has happened to me, and most likely to others here, although on a less 'perfect' scale to the one shown by Lumpy.

A nice novelty thought his Grandfather and we get to see it today all these years later.

Londonbus1

Perhaps. I guess we'll never really know. Back into the collection it goes...

Many thanks to all who assisted.