Can someone explain the difference between:

Filarmonica Sello Oro 13 BLACK BOX
Filarmonica Doble Temple 13 WHITE BOX

It looks to me like the black box Sello Oro is the older model? Also on the Sello Oro there is no stamp with 'Jose Monserrat Pou'. The Sello Oro does not appear to have jimpwok on the tang whereas the white box one does.

I would welcome clarification of the above from an experienced Filie fanatic!