The Holland #54H vice is not, I repeat is not just a #54, there is a difference between the two and I weighed mine prior to mounting the vice on a 10" steel post column and it weighed in at 136# on a certifiable scale. From my research on Holland it appears that the #54 was introduced around 1910 but I could not find out when the 54H was initially produced nor the last date of that production. Mine has the serrated jaws/teeth units that mount in the 3 slots under the main jaws and held by the set screws. One tooth is damaged on one of the three (3) jaws and I may build it back up via welding and re-grind to proper shape, but it has no effect on using it. On the other end on my 12" steel work bench I have a HOLLAND pipe vice m(almost as large as the 54 vice), that can be mounted in several positions, as Holland manufactured the pipe vise base so it could be pole mounted vertically, or bench mounted horizontally. I have over the last 10 years more than once been offered $750 for the 54H vice and stand and the stand was all scrap metal material, worth maybe $60 and my fabrication time. My 2 Wilton $800 vices do not perform as well as the old Holland, and the Wilton's will go before it does.