Heres a rare and nice set of 4 pots of the same seal type, courtesy of Biao Zhun Hu (標準壺) on Fb.
the owner of these pots had contributed significantly to the recent teapot book from wushing publications.

From left to right - Bian Yuan (flat round), Bian deng (Flat lamp), Roubing (Meat cake), Xianpiao
the Yixing Hui Meng Chen Seal is considered to be one of the earlier 6 character seals used, both before factory and during early 60s. To compile a set like this of the same seal is not an easy feat today. the concept of "wu xing" hu or five pots, came only in the 70s (no sixties Eunuch pot/Taijian Hu was sighted before).
in the sixties, there was mention of 四君子 pot, or 4 Scholar pots. However the 6 character seal Xishi is so incredibly rare, and it is more common to be able to get a 6/4 zhong guo yixing seal Xishi. In this set, the Bian Yuan takes the seat of the XiShi, and this bian yuan shape is also uncommon. This shape was most commonly seen during early ROC to 60s. There was sightings of a piece of 70s neizhiwaihong bian yuan, but not in large supply perhaps. hoping to get my grubby fingers on the 70s Bian Yuan or the ROC bian yuan if i get to sight it
