Uhm... I think this 610.610 deserves attention and probably a good expertise :
1) Nothing strange that it doesn't bear a "Canadian" engraving... most of Ontario IIIfs bear the std. "Wetzlar" engravings (various kinds of); only 194 (seems) were engraved (4 rows - different sizes of letters)
"Ernst Leitz -
Canada Limited - Midland - Ontario" , all into the 1953 batch 684.001 - 685.000.
2) The 610.001 - 611.000 was the first batch assembled in Canada, 1952.
3) BUT the depicted 610.610 has Red Dial and the "new" time scale with 1/25 1/50 1/75 ! : all the texts state that the new shutter began at 615.000 (Wetzar - 1952)
4) One can speculate that the depicted item was "upgraded" later to the new shutter, but is worth noting that the new shutter was mounted on previous s/n belonging to models IIf (from 574.401) : anyway, the year of those IIfs was once again 1952... so some situations of "mixng shutter" can be understandable.
5) In 1952 the "25-20-75" shutter anyway had been for some time in Leitz labs: in 1950, a prototype of IIIf (Betriebsk n. 276 - Italian collection...
) was built with this kind of shutter.
So, Nick... don't worry about focusing... surely repairable... this camera is very very interesting, and I'd suggest you to contact some historician through LHSA to have a sure identification of it.