Help In Identifying A Stamp's Catlaogue Value

I tried to find this stamp in scott catalogues but I didn't find anything I searched in ADEN and Yemen and south Arabia

Hi! Check, please, ($25)
http://www.ebay.com/itm/SOUTH-ARABI...350915206768

^^ yeah but where can I find it in the catalogues?

If you are trying to find it in Scott's Catalogue it is not likely. Your best bet would be try to Gibbons or Michel.

I don't think Stanley Gibbons lists that one. I presume it has cinderella status as it was probably issued either in excess of legitimate postal use or only to collectors. At least that was the case according to my SG catalog but it is a few years out of date.
Saw one recently that had a Michel number and cat value of UK£1.60


edit: sorry, the £1.60 was for the single stamp. The sheetlet/ mini sheet sells for around 12 Euros
http://www.stampworld.com/en/stamps...-1968?user=0

^^ thanks a lot guys but btw the link didn't work it is not free :)
update the Link worked fine but I am still trying to find any info in catalog