2short,
That Engine number does not make sense. Except for some early ones (as far back as the 116 series), all of the 2A engine numbers start with 253.
If the person who gave you the number got it wrong, could it be 25350137K?
If so, that would make it 178 325, a 1971 GS sold off in 1979.
The photo certainly looks like a late 2A, what do you think?