The manufacturer's name is stamped just in front of the serial number.
You will have to contact the company to find out.
No published serial number data.
it was made in England
Rubber washers manufactured by the Acme Rubber Company can be found at a number of places. Amazon has a large selection, and even a local Walmart is likely to carry them.
1910
1871
2006
Just saw a site saying a serial number 88000 was manufactured in 1916. So it may give ya an idea.
Mass number = p + n = 13, and atom number of Carbon = number of protons = p = 6 So n= number of neutrons = 13-6 = 7
No known sn data published.
No published sn data I am aware of.
Early 1930s