It is funny you posed that question, as I just brought home a new to me 28" 835 Waterfowl in Mossy Oak Shadow Grass. I have a 24" 835 Turkey gun in Advantage Timber I bought in 2001, and I owned an 835 Deer & Waterfowl combo years ago that was in the original Realtree All Purpose Green camo (circa early 1990's).
I handled an as new, unfired 835 Deer & Turkey combo yesterday that was in the original Realtree Extra Grey. That was also a pattern from the early 1990's.
I would say that you could not count on both hands and feet the number of patterns that has been applied to this great shotgun since it was introduced in 1988.
The newest piece to my hunting gun collection. Mossberg 835 Waterfowl in Mossy Oak Shadow Grass. I installed a Tacstar 4 round side saddle in matching camo, a Tru-Glo Flight Stopper front sight, and a Black Rain Tactical oversized safety. I also have 2 Carlson's Black Cloud choke tubes for it, the Mid-range and the Long range. As with all older guns, there are some areas of character on it, but the gun's action is spotless and buttery smooth. It should make a fine duck/goose gun.
Just got my stock back for the 835 from Rodney Stumbo at Rods custom stocks. Amazing work!!! Looks like it came straight from Mossberg factory. Hope to get the Millet redot sighted and send some Sabots down range, soon. I am currently working on a front mount for the Harris Bipod, just need to finish up some more machining when I get some time. For now I'll post up the adjustable comb from Rods Stocks.
The other stock pictured is one I just got done refinishing myself for the 590A1. These both look amazing in the sun. They are almost chameleon like and in the sunlight the grains really come at you. I shortened both stocks and they have a LOP of 13.5/14.0, from trigger to end of butt pad. I have both stocks with the Limbsaver 10121, which is for the shorter 4 7/8 stock.