Originally Posted by Left Hand Percherons
Actually, most farm teams are driven in loose ring snaffles.
They may be in your neck of the woods but it's neither common nor recommended by driving trainers. Unless of course you mean a Wilson Snaffle which is an actual driving bit and commonly used with Trade or Heavy horse turnouts.
In your picture they both appear to be in snaffles.
Do you mean my picture? I'm thinking you must as I seem to be the only person that's got a photo of a pair.
Trust me, I DON'T ever drive horses in riding bits! They've both got Liverpool driving bits.
The other most common bit is a straight bar bit aka military bit.
The most common driving bit is a Liverpool driving bit and which comes in a range of mouth pieces.
I've never yet known anyone buy a pair of driving horses and not know how they were harnessed and bitted and that in itself does not bode well for the future. So best advice is that the OP needs to better understand bitting and the effect of bits on a driving horses' way of going and if he/she wants to know what the horses were driven in then they need to ask the person they've just purchased them from.