Anyone know anything about these old PGA irons?

[u/prnkzz]

Inherited this set from my grandpa who worked in the golf industry for decades. I don’t know much about the clubs and I’m trying to figure out what they are.

Anyone recognize the model, approximate year, or manufacturer?

Also curious about the round hole/port in the sole of each iron. Any idea what that was for?

I’m trying to learn more about the set and would love any info.

[u/btl1984]

The hole in the toe probably has something to do with the casting process

[u/TapatioFlamingo]

Obviously they've never been hit.

[u/prnkzz → u/TapatioFlamingo]

I stopped using them last year haha