I Have Ruined A Stamp

Going thru a pack of stamps I received and this stamp was inside an envelope of another stamp and I ended up cutting it. I would like help identifying it before I throw it away, just in case it is my million dollar stamp. LOL
It is a brown stamp with Queen Elizabeth on it and in the lower left corner is 7P. Can anyone identify this stamp for me?

http://lmgtfy.com/?q=great+britain+7p+stamp

:)

Thank you Mike, looks like I only threw away a dollar at the most.

If you buy a few random worldwide mixtures, you're fairly likely to end up with several examples of these. I bet I had about 50 of them not long ago before I sold off a pile of duplicate Machin Heads (the name of the design of these stamps) on ebay. In other words, don't fret. Another one just like it will probably be along shortly.

It has happened to me more than once

If that is the worst thing you ever do feel lucky.

Don't feel bad...I had quite a devastating stamp 'gaff' last year. It involved a large shoebox brim-full of duplicate worldwide stamps that I took to my workplace with me with the intention of taking them during my lunch hour to a local dealer who puts such things on consignment sale. I ended up getting swamped with work and did not take a lunch break. In shuffling paper, notebooks and equipment on my desk, I 'temporarily' moved the box of stamps to the top of my trash can to 'get it out of the way'. It was the only space I had left to set anything on at one point.
At the end of the day, the box was forgotten, and you might guess what happened....trashed by the janitors! Gone... Dag-gonnit! I guess my only hope is that the box was opened by the janitor, the contents recognized, and kept. What a shame it would have been to have it all end up in the dumpster. There were not particularly any real valuable material in the box, but there were a lot of older stamps that would have been great for someone's collection. Collectively, I could have sold them for around $50 for the lot. Oh, well, live and learn...

My stamp snafoo was when I lived at the coast. I had approximately 100+ blocks of 4 in a box. I planned on putting them in a stock book but was beaten by humidity. By the time I got to the blocks of 4, it was one block. They were all stuck together. Fortunately they were modern stamps, (3c and up) however ever, never to be mint again. Now just unused with no gum. Lesson learned.