The "smithy" has been given category one status, meaning it is a place of special or outstanding historical or cultural heritage significance or value.
There were seven "smithies" on the trust's register, but Nicol's was the only one associated with a small town.
It was saved from demolition in 1974 when it was bought by John Hore, Burns Pollock, Bill Simpson and the late Jim Harvey.
As children, the four men had spent time with then-owner Nicol Muirden pumping the bellows for him.
He had taken over the business in 1930 and operated it until 1966.
He sold to Tom Gibson, an engineer-mechanic, making Mr Muirden the last blacksmith to work the smithy.
Mr Gibson used the premises for light engineering until 1974.
In 2006, the Nicol's Blacksmith Historic Trust was formed, with the intention of restoring the building as a heritage attraction.
The trust was delighted the Historic Places Trust had recognised the foresight of the farmers and it looked forward to seeking community support to make the restoration project a reality, trust chairman John Hore said.
It had been great over the years to be able to educate young people about the past, Mr Hore said.
The business was founded in the 1890s, catering to the needs of horses and horse-drawn vehicles, as well as making tools and equipment for farmers.
It later included a carriage building and paint workshop, and expanded in the 1920s when a motor garage was joined to the smithy to cater for the growing motor trade.
Today, the building is very much in its original condition - timber-framed and clad, and unlined.
The interior of the working areas are full of the original equipment, including the forge, bellows, wheel pit and jig.
