This is what I call an "Industrial block". Industrial blocks are loaded with holes and the side impressions include hexes for making bolts. This appears to be a Model 630 Green River Swage Block. However, it was very common for block makers to steal each others designs and many of these patterns went with the sale of the company over and over.

This very nice 12 hole block is almost unused and has one broken corner.

Weak corners are the bane of the swage block designer. The goal of the commercial block designer is to fit as many features as possible. The features on a commercial block (as apposed to a personal block) are a guess by the designer and putting as many features as possible on a block is an attempt to provide a useful universal tool.

• Solid Cast Iron
• 12 x 12 x 4 inches
• 12 holes of various sizes and shapes
• Note: Broken Corner (see photo below)
• WEIGHT: 100 pounds ??

How to Use a Swage Block The original How-to article for swage blocks by Jock Dempsey, anvilfire guru.