How to tell monotype from foundry type

[rigger]

I have a little more than 50 pounds of type metal and am not sure of what it is. I was someone could tell me by looking at a picture.


317003

[lightman]

Foundry type has a notch in it like your picture shows.

[rigger]

Thanks lightman. I thought that's what I had but wasn't sure.

[colchester]

Here is a link to some info as well as some details
https://www.apa-letterpress.com/T%20&%20P%20ARTICLES/Type/Identifying%20type%20castings.html