The OP's image is using a "Precision US Specialty Multi Gauge", however I will illustrate this with a Phil-A-Meter Gauge, which has the same principle.
Orient the gauge upright and align the stamp very carefully with the upper left corner of the design, then see if the stamp is wide enough or tall enough to have the image touch the wider lines at right or bottom.
Flat plate, the design is definitely short of the wider black lines:
Rotary plate ( a type III coil, which MUST be rotary), the design touches the wider black line at right, as one would expect:
Posted 02/25/2023 7:27 pm
