Ok, finally got it! (was rather busy month at work, but that's another story).
So, used multimeter to find filament which was rather easy (one connection i saw, other one i just bruteforced
it's a pair of legs on separate sides of the tube with ~45 Ohms between them.
Applied 3.3v across them, and tube drew around 26mA on filament. I didn't actually see gloving of the filament, so perhaps it could be increased to 5v as per IV-27 datasheet, but 3.3v volts worked fine for my purposes at this point.
On the anodes i've applied 12v and this lighted the tube up (it was drawing about 9mA on the anodes).
The only issue so far was that 13th segment didn't light up evenly -- it was darker comparing to the rest of segments. Hence the question: is it because of not enough power on the filament/grids or it's about physics of rather oldie tube?
Attaching a photo of the lighted tube (for those who're interested). And also attaching pinout of the puppy. Sorry for the crudity of the scheme, didn't have time to build it for scale or paint it!
(and i do hope i didn't screw up when was drawing scheme on the computer).