Philadria d.o.o. - catalog 21st auction - April 2019
,38, S. 139,Cover, franked with 50 para, mixed franking of two 25 para stamps (Chainbreaker and Serbian stamp), sent registered from Zagreb (920, NOV. ? ) to Innsbruck (3.XII.20). The Serbian stamp has a horizontal crease and as such affixed to the cover).