The back of this photo.
This site seems to record the details of Hong Kong stamp costs
http://www.hongkongstudycircle.com/Papers/005_HK_PS_web_article_Scamp/al...
If I've read the chart correctly, the 4-cent charge for postcards came in in 1894.
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4-cent postcard stamp
This site seems to record the details of Hong Kong stamp costs
http://www.hongkongstudycircle.com/Papers/005_HK_PS_web_article_Scamp/al...
If I've read the chart correctly, the 4-cent charge for postcards came in in 1894.