CERTIFICATE OF ORIGIN SHIPPING DOCUMENT
A Certificate of Origin or Form A is an evidence of a country of manufacture & normally made out by the Dept Chamber of Commerce which is a private org in Thailand and not the Government. . GSP stands for the Generalized System of Preferences. It helps developing nations like Thailand to speed up their economic development by allowing their exports to enter countries with origin stamped or for duty free purposes. The only requirement was that a particular country be first approved for the GSP list of countries and that the appropriate Certificate of Origin, Form A, be attached with the shipment. To meet such a standard was not only based on the economic criteria but also subject to meeting certain political guidelines. For Germany you must get a Cert of Origin from the DFT dept.
Thailand directory and Thailands No1 original Trading Post

A Certificate of Origin is a document used to verify the country of origin of the item being exported, while a Form A Certificate of Origin is used to support certain products to claim for preferential tariff entry into a number of developed countries under the Generalised Systems of Preferences (GSP).
If a country is on the GSP list, you, as an importer, can import goods from that country duty free provided that your shipment is accompanied with the Form A document. If, however, your shipment arrives without such a document or the country loses the GSP classification while your goods are in transit, you will have to pay duty on your goods based on a classification out of the Harmonized Tariff Schedule under which your goods are entered through the US Customs. The only products, typically, that do not qualify for the duty free exemption under GSP are garments and textile articles in general. The only nations that are excluded from this limitation are the those that are classified as as a Least Developed Beneficiary Developing Country under the GSP.
Under the EU Generalised Preference Scheme of which China is a beneficiary, a valid Form A Certificate of Origin is required to claim preferences when the goods from China entering the EU countries. Please consult the China Commodity Inspection Co Ltd which issues the Form A Certificate of Origin for China. Its website and details are: http://ccichk.uhome.net/English.htm
If importing some items from China to Thailand to qualify for lower import duty taxes on these items, you must present a Certificate of Origin (Form E) approved by the China Council for the Promotion of International Trade. The Chinese supplier if they are an approved exporter can get this document but may charge costs $100-180 USD to process, and takes at least 3 days to prepare. Make sure the form arrives before the shipment not after. We can arrange if you want us to be your clearance agent.