[Lamey Knives]

50 lb LG dies- 3.5 l x 2.5 w x 3.5 h (heigth can vary 30% total before die change is recomended). The demensions can vary, as long as the bottom die face isnt bigger than its supporting surface of the die block or frame. The heigth comes from LG, and they recomend changing if the total heigth is 30% less than 7" total.

Those do look like LG dies, as the top has the odd tapered dovetail. Bruce are those 2 piece dies? I see some countersunk bolts i believe.