Thanks...... so that isn’t a Hylift Johnson lifter.
The metering disc is the Stanadyne “style”, although Stanadyne doesn’t make lifters anymore........ so those could be either Eaton’s that have a different metering disc than they used to have....... or possibly an import(other than Eaton).
As far as I know....... the current Eaton stuff is made in Mexico, since they bought out a manufacturer down there a number of years ago.