I now received some relays. It's time to characterize them !
Coil resistance : 35Ω
Coil inductance : 28000µH
Latching : 2V@0.06A (120mW ±20%?)
Release : 1.1V@0.04A (44mW ±20%?)
They are sold as 2.8V and I tested them with no load, I don't know how much current they can withstand. Anyway, switching 16 relays will draw 1A.
The coils look very compatible with the tiny incandescent lamps !