Cross shaped
"NOTICE: this list is no longer updated, as this type of stamp is no longer considered to be unusual."
1970 - Tonga (adesivi / self-adhesive) 1974 - Tonga (adesivi / self-adhesive) 1978 - Tonga (adesivi / self-adhesive) 28-07-2011 - Guinea Bissau 17-11-2011 - Guinea Rep. 12-2011 - Guinea Rep.
"NOTICE: this list is no longer updated, as this type of stamp is no longer considered to be unusual."