An extract isn't cheap but probably would add value if you were to sell as it confirms that the movement started life with the case. There is nothing in that serial that suggests otherwise but there were other lesser models that used the 321 in the same era so it is possible. One plus would be if it had anything unusual in the notes. Mine was sold at a UK military NAAFI (and I bought it from a retired soldier) and the extract shows this, it's not really a value adder but it does provide insight and interest.
