Singer Sewing Machine Cert.

I have found in my mother's things, a Certificate of purchase of a Singer Sewing Machine from 1914, which my grandfather purchased for his wife. It has the cert. number, the cost, the machine number and the style number. I am not absolutely sure of the handwriting - on the machine number - it looks like an F, but could be a T followed by 7 numbers. Purchased in Willesden Green, London Eng. Any ideas??, style number looks like 66 with a little 2 then 3Dr C T Maybe someone has something similar??