Hallmark dream meaning is explained below using 2 different sources. Each interpretation is shown with its source.

Interpretation 1 — Zolar

lucky numbers: 05-09-13-17-24-42

missing on your gold articles, being: wil fail to accomplish your designs.

of a: reputation wil be injured by a two-faced friend.

stamped on gold and silver, being: loss through negligence of underlings.

possessions: wil be forced to grant privileges to unworthy characters.

Source: Zolar’s Book of Dreams Numbers and Lucky Days Author: Zolar

Interpretation 2 — Stearn Robinson - Tom Corbett

To be aware, in your dream, of a missing or false hallmark, is a warning of treachery among your associates, but to observe a hallmark where expected is a promise of success in your current interests.
Source: The Complete Guide to Interpreting Your Dreams Author: Stearn Robinson - Tom Corbett