My Favourite Singer

I recently picked up this Singer 99K. It is in a Bentwood case. The machine came with a hand crank and 3/4 treadle.
The machine and base drop in to the treadle and is held securely by four cast metal brackets. The bas has two holes to accept the treadle belt.
So far I am not finding much information about this configuration online.
I do know from the serial number that the machine had a slated proiduction date of 1913. The woman I purchased the machine from brought it to Canada from England. She purchased the machine from a family friend and the machine had been stored in a barn.
I have cleaned and oiled the sewing machine, which turns like hot butter on corn and I restained the wood table top. The leg irons were washed and left as they are. I'm not big on full up restorations because I like the history to show through.