If you have to ask if it's a 1955 doubled die, it's not. This is the DD you're looking for. I see no doubling on your coin.
Is this a 55 Double Die? I dunno. Is it THE 55 Double Die? Absolutely not! It was made in Philadelphia and your coin is from Denver
There is another 1955 P "doubled die" called the poor man's doubled die, which is just extreme die deterioration that looks a bit like the doubled die, especially in the 55.