Well the amount of Sulphite is relatively high in comparison to Beutler's High Definition developer, 15 g/litre as opposed to 5 g/litre in the working solutions D23 or D76 at 1+3 would be 25 g/litre

If we take Beutler as the one extreme - Metol with a low sulphite level and the D76/D23 high Sulphite level as the other then this developer fits somewhere in the middle. The relationship between sulphite level and fine grain isn't prportional.

This was probably a fine grain developer of it's time relative to older developer formula. It has to be remembered that until 35mm film usage became wide spread most film developers were like D72 or Pyro based and people developed to very much higher gammas and densities.

Kodak Research only published their first Fine grain developer in 1927 followed by D76 as a cine developer (not recommended at that point for still cameras). This developer was published in 1940, D23/D25 were only published in 19444.

These days D76/ID-11 which was in effect an Open Sorce formula is taken as the benchmark to compare other Fine grain developers against, by the 1940's and 50's nearly every manufacturer made it - Defender 6, Foma FV3, Forte FD20, Foton N12, M&B 320 are just some of the names it was sold under. It became a standard because the Movie industry needed standardised processing regardless of where films were processed around the world.

I wouldn't give this particular formula to much importance as it is but by switching to Potassium Sulphite (because of it's higher solubility) and increasing the Sulphite level you would get you closer to some commercial one shot concentated developers.