Bit surprised at this answer - I thought all immigration authorities have to stamp if asked http://en.wikipedia.org/wiki/Passport_stamp. But I don't see an appeal from this:

http://www.immd.gov.hk/en/topical/no...clearance.html

Q 2:

Can the visitor request stamping on his/his travel document so as to keep the travel record?


A 2:


Upon implementation of non-stamping immigration clearance arrangement, the immigration counter officers will not stamp on the visitors’ travel documents. If the visitor needs to refer to his/her travel record, he/she may submit an “Application for a Statement of Travel Records” to the Records Centre of the Immigration Department and pay the application fee.