Yeah, that one (and Minora, Grom and a few other brands) were based on the 1940s flat bottom plate which morphed into the Tech in Britain. Generally, the ones with the long slot are American or the earlier 'New' style. What was "New" was the blade, actually, which had a long slot ... and so the razor top cap got a long slot to fit through the new blade. The channel in the baseplate accomodated the long slot.
The "New" blade:
I put this picture in one of the many 'History of the GIllette Tech' threads ...
View attachment 90549
You can see how from 1-4 the long slot morphed into the twin slot. Even the RFB in position 4 which could have accomodated a full long bar top cap was more often found with a twin slot, but notice the bars are wider/longer for the RFB in 4 versus the Hybrid Tech in position 7. You can see that those slots are directly related to the single long slot with rare flat bottom long slotted baseplate in postition 3. The long bar in position 3 had to have the very central parts milled down a tad so that the handle screwed up properly.
I also pointed out that (somewhat ironically) the pre-War Tech in position 8 had a long bar representing the start of the Tech era and despite all those flat bottom and raised flat bottom changes in the 1940s, by the 1950s Gillette had standardised again on the long bar top cap as shown in position 9.
So, what does a short comb look like? I have shown you before
@saj1985 but here's a snap ...
Short comb
Long Comb (British)
Long Comb - Goodwill
Long Comb - Flat Bottom