Can somebody please give a answer as to what this Cross is and which country it comes from.
It is 50mm wide, or 55mm diagonally across the points. Obverse and reverse are identical. The cross hangs from inside the crown.
Graeme Maltese Cross.tif
Yes, many insignia varients exist. Spanish identifiable usually by "H" in center but not always: other indications include red rays between cross arms and lack of fleur-de-lis between cross arms. Often badges appear on braided black/white cords instead of ribbons, anoher indicator of "Spanish’ insignia. [some examples: https://www.google.com/search?q=THE+HOS … 2#imgdii=_ and http://www.medal-medaille.com/order-kni … 10328.html].
As you see by the group’s history sometimes ‘confusion’ over insignia could result in "Spanish" members being recognized as "Malta" members to an individual’s potential social benefit. At times, the ‘Spanish" Order was somehow not ‘quite legitimate’ in others’ opinions.