The mark is 其昌
(Ch'i Ch'ang / Qi Chang), presumably the name of the silversmith.
Have seen a Hung Chong teapot with the same maker's marks dated to the 1890s, so your tobacco box may be a decade or two older than 1920.
Surely you have already seen the splendid information on Hung Chong that Trev posted under Contributor's Notes, here is a link as a courtesy to readers of this thread:viewtopic.php?f=38&t=24259
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