Identifying an Enderle pump size?

Is there any way to tell what an Enderle 80A pump size is (0, 1/2, 1) without having it flowed? I know on some (if not all) the size isn't cast into it. Thanks for the help, trying to get an injection education!

 

Take the front plate off and measure the thickness of the gear.

 

Thank you for the response. I don't have anything to tell me what that number will correlate to (I don't know the thickness of the different sizes). Is it as simple as calling enderle and giving them the size I come up with?

 

They are there to help you, Jim is the one to talk to