A few issues to tackle here:
First, doubled dies are never limited as to what they can be found on. If it hadn't been for a board member here this past year, one could have realistically (but erroneously) said that there was no such thing as a 1982 cent doubled die reverse. Well, that was proven wrong because someone thought to look where nobody else bothered....including me. Saying that doubled dies for 1955 are limited to P mint is as wrong as it can be. Doubled dies could exist on any issue made with dies created using the multiple hubbing process.
Second, The stuff listed on my site is what is currently known by myself and my staff. It has nothing to do with what's possible. Anything is possible.
Third - a majority of the known major doubled dies are Philly mint...but there are a number of branch mint doubled dies that are very impressive...1942S, 1951D, 1954S, 1955D, 1964D, 1970S (both proof and business strike), and others...and that's just in Lincoln cents. While the 1969S is a classic, it's not alone.
Littleboy - Good thinking, but it's actually a misguided thought. many die variety collectors wouldn't want a die variety that's also an error, and many error collectors wouldn't want to pay more for an error just because it's a doubled die. Errors and die varieties are two different things, and when they mix on the same coin you end up with a white elephant - a coin that's hard to price and hard to sell.
Lastly, and most related to the original question - the 1955 "poor man's double die" is not a doubled die at all. It's the result of a coin struck with an excessively worn die, and they are very common for a number of different years in Lincoln cents, to include 1955. They are not really premium value coins, although misguided dealers charge a premium to misguided collectors. I have found them in the hundreds and discarded same. I don't bother keeping them because they are on literally half of all 1955 cents...a year where die use was excessive.
Doubled dies, on the other hand, are a single die and the coins it makes. Once it's retired, no more coins exhibiting the doubling are made. It's a completely different animal from
Die Deterioration Doubling (the fancy but correct name for the poor man's doubles).