The caseback seems off, i have a Reduced with a black dial and i do have a caseback with the Seamaster horse. Also the bracelet of your Reduced is really worn and the endlinks fit really strange. It should have the 811 endlinks but i cant read the letters very well on yours, seems like 810 on yours?
The white dial seems legit to me, but thats just as seen from the unsharp photo's.