Dear Sirs,
we have learned from the Commercial Counselor's Office of our Embassy to your country that you are one of the leading importers of clothing ,We would like to introduce ourselves to you as a corporation specializing in the product of clothing .And we are interested in establishing a business relationship with your for the purpose of supplying you the commodities you want.
To give you a general idea of our products ,we are sending you ,under separate cover ,our latest catalogue together with a range of pamphlets for your reference.there exits clothing of many kinds for you to choose from.
Our clothing has been awarded by many prize. And it's won great popularity in markets at home and abroad . There must be a great demand in your country. Please tell us your concrete requirements so that we give you our best quotation.Generally speaking ,the larger your order is ,the more discout you will get.
It's our good hope to promote,by joint efforts ,both trade and friendship to our mutual benefits.
Looking forward to your early reply .
yours faithfully
XXX
虽说估计没有三百字,但是内容差不多很完备了
Commercial Counselor's Office of our Embassy 是我国驻贵国大使馆商务参赞处,你从哪得知对方公司信息的就写从哪得知的了,信中提及这点很有必要。