Singapore has had both 120 and 160 mm mortars. The 160 was retired long ago, the 120 remains in service to this day. Whether it is made by Soltam, Chino will surely be able to tell next time he's around.
The old days. No, we don't use any 160mm mortar anymore. It is muzzle loaded BTW, and at a Singaporean website the collective guestimate was that the barrel is lowered by way of hydraulics for reloading.
And those in SAF are "officially" the Tampella (or Patria Vammas) M58 160mm mortar (Finland).
However, Wiki and a couple of other sites including Janes's list SAF as a (former) user of the Soltam (Israel) 160mm mortar. Hard to say since I've never been near one and the Soltam is a copy of the Finnish M58.
Again, officially our towed 120mm mortar is apparently the Tampella (Finland). And again, some websites list our 120mm mortars as Soltams. Some say we operate both.
The towed 120mm in SAF is not like the one DavidDCM attached. It has wheels just like the 160mm shown here. The one pictured in DavidDCM's post is probably the one found inside the M113 Self-propelled Mortar. Or an infantry support coy asset. Though if so how the infantry move this beast without wheels is beyond me.
We have a new 120mm mortar (well, less than 10 yrs old) that is automated called the SRAM seen here mounted on a Spider Light Strike Vehicle.
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Regarding towing vehicle, in SAF a 5-tonne truck was required to tow the 160mm mortar which weighed around 1.8 ton. The 5-tonne is a big powerful truck, about the size of a large bus. And since each 160mm bomb weighs over 30kg, 10 of them would be 300-over kg.
That's why I tend to agree that the 1.2 ton Oto howitzers being towed by a LR is probably just a marketing gimmick. On smooth asphalt road (or "metal" roads as we call them in army intel), sure. On a muddy track, most 4x4 wheeled vehicles can barely move themselves, much less towing something half its own weight.