Little has been wrote about this weapon of Chen Taiji – the double mace 锏. It is considered to be a short weapon with a square cross section. Usually made from copper or iron, it it about 4 feet long. The diagram above is scanned from a 1992 special issue of the shaolin and taichi magazine.
Here is a clip showing the performance of the double mace form by Chen ZiQiang. In this vide, he seems to be using sticks to replace the mace.
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Master Zhu Tiancai is one of the big 4 from the Chen village. His interpretation of Chen style taijiquan is a class on its own. His display of silk reeling energy in his forms makes it very beautiful. Based in Singapore for most part of 1980s to 1990s, he has started to tour other countries to spread the art.
This is one of the newer titles that Zhu Tiancai has produced. Other titles in the new series are :

Old Frame Routine 1
Old Frame Routine 2
New Frame Routine 2

The video quality is …

Someone posted a link of the partial translation of the well known  Chen Shi TaijiQuan book in the ChenWired  forum.  This is my favorite Chen style book with very detailed analysis of the New Frame Routine 1 and 2. Interestingly the translated articles were found on the Yang Family taichi site.
The 2 articles links are

The Fourth Characteristic: An Exercise of Empty and Full in which the Body Stands Centered and Upper and Lower Body are Coordinated
The Second Characteristic: An Exercise of Springy Lengthening of the Body and Limbs

Enjoy reading!