Can anyone identify this bit?

[mrsk29]

Having looked all over the internet I cannot find what type of bit this is... anyone?

Thanks

 

[touchstone]

It's a crescendo bit, used on trotters.

 

[onlytheponely]

It's a driving bit. Don't know anything else about it though apart from just googling it and found it called a 'Crescendo'.

 

[mrsk29]

Thankyou

 

[touchstone]

You're welcome.

 

[curio]

http://www.zilco.com.au/products/122520