I went and looked at my two Free made New Royal machines - and from what you've said -it's a match.
To confirm - here are some pictures of them.
Some sort of inspection plate on the front (notice, my two are not the same, but they both have one).
Patent date on the front slide plate - slides are SQUARE on back end, not with a rounded notch.
Number on back right corner (behind pillar)
Foot gap- if yours is 1/8" - Free is the only one that used the narrow gap - all others used 3/16" gap. (I'm gonna check the measurements in case I got them wrong, but Free is the only narrow one)
Tension release - like this
