Does anyone know what year this lens came off of?
Model A, late 1927 to early 1929.
Your lense is from a very early Model A. I own SN873 and would be very interested in buying it if it is for sale. I was used only in the first 3-4 months of production and discontinued sometime in January. If interested in selling, contact me at firstname.lastname@example.org.
Interesting item - the very first Model A tire pump also has a T-number on the bottom. I wonder if parts were being bought before Henry decided what to market the car as...
Several items had T numbers on them such as the spring shackle tie bar.