Used stamps exchanges.

I received a very nice lot from Marko in Slovenia in a registered cover. However, there's no registration number written on the outside or the inside so I can't register it.
So, Marko Karlin, if you're reading this, please mail me the number so I can register.

Thanks! Jeannette

ID I wrote below, under your address.
ID of this letter is SI-175
Regard Marko K.

send Danubius a message, he should be able to find that number for you.
http://100stamps.club/profile/Danubius