identification Bronze proof or just cleaned copper coins?

[bensharp27]

I have been collecting coins for 15 years or so since my grandfather left some coins to my father (who gave them to me).  I love researching them and learning the history, significance and value of them.

I have been picking up some British coins along the way and am only now going through what I have.  I noticed a couple of the Pennies look different than the rest and I am not sure what I am looking at.  It appears there were Bronze proof coins made these years, but I would not presume that to be likely since I didn't get these from a dealer or anything (they were just among others in a collection I picked up at an auction some years ago).  

They are 1927 and 1934 one penny coins.  I would upload images, but not sure how (keep getting an error about the files being too large to upload)?  How can I tell if they are something worth more of a look or relegated to sale on ebay as cleaned coins (with a lower value than the others)?  Also, is there anything I should be looking for in 1900 and up one penny coins?

Thank you all for your time!