https://en.numista.com/catalogue/pieces578.html https://en.numista.com/catalogue/pieces959.html https://en.numista.com/catalogue/pieces3748.html I really like this website a lot, and you can use it to catalogue your collection.
It's ok to say Metal Detecting I have dozens of threads where I always mention Metal Detecting! Metal Detecting is a beautiful statement!
I have 3 Metal Detecting Machines White's Classic 5ID Minelab CTX3030 Minelab Vanquish 440 If you ever plan to buy a new Metal Detector I highly recommend the Vanquish 440! Not to expensive with excellent results!
Nice detectors to both of you! I have two (we bought a second one so my dad and I could detect together): Minelab GoFind 60 and an Ace 400 I believe, not including the previous, now-broken metal detectors that I still have. They are both fun, but we have not detected many spots since it's so hard to know where to go!
There are two different types of 1921 penny: http://www.coincuriosity.com/view/british-pennies-1920-1921.html Yours looks like obverse 3 to me.
The spacing of the text around the King's head can vary a little but both types of spacing are common.