Silver foil affixed (from 1968 to 2005)
"NOTICE: this list is no longer updated, as this type of stamp is no longer considered to be unusual due to the number issued."
24-10-1968 - Norfolk Is.
27-04-1971 - Sierra Leone
20-07-1972 - Tonga
10-01-1977 - Togo  
01-03-1977 - Libia / Libya
02-10-1978 - Guinea Bissau
11-1978 - Congo    
14-11-1979 - Gibilterra / Gibraltar 15-02-1984 - Libia / Libya
18-01-1988 - Paraguay
20-05-1988 - Canada
29-06-1989 - Canada
03-05-1990 - Canada
07-05-1991 - Canada
29-06-1992 - Canada
01-08-1994 - Libia / Libya
30-12-1996 - Libia / Libya
20-10-1997 - Libia / Libya
05-03-1998 - Libia / Libya
01-07-1998 - Libia / Libya  
05-12-1999 - Thailandia / Thailand (foglietto in oro, argento e bronzo + francobollo singolo)  
02-03-2000 - Libia / Libya
01-09-2000 - Libia / Libya
08-01-2001 - Christmas Is.  
01-02-2001 - Hong Kong (argento + oro / silver + gold)
02-03-2001 - Libia / Libya
02-04-2001 - Libia / Libya
01-09-2001 - Libia / Libya
10-01-2002 - Singapore (argento 99,9% + gold 22Kr)
06-02-2002 - Jersey (argento 99,9% + oro 22Kr + oro 24Kr)
09-02-2002 - Hong Kong (argento + oro / silver + gold)
13-04-2002 - Kyrgyzstan
01-09-2002 - Libia / Libya
19-01-2003 - Hong Kong (argento + oro / silver + gold)
19-02-2003 - Russia  
02-03-2003 - Libia / Libya
04-01-2004 - Hong Kong (argento + oro / silver + gold)
21-04-2004 - Russia                
12-08-2004 - Canada
30-01-2005 - Hong Kong (argento + oro / silver + gold)
28-10-2005 - Finlandia / Finland (argento + oro / silver + gold)
"NOTICE: this list is no longer updated, as this type of stamp is no longer considered to be unusual due to the number issued."