worry, these Firestone spark plugs may be over 70 years old but they are no longer
radioactive; they are perfectly safe to own and handle. The radioactive
Polonium 210 used in the electrodes was supposed to improve engine performance
and fuel consumption (apparently it didn't...) but in any event it had a short
'half life' of just 138 days, which means that three years after they were made
virtually all of the radioactivity had decayed and turned into a
non-radioactive isotope of lead.
have managed to acquire a very small number of these spark plugs, which were
recently discovered in a bankrupt auto parts store. They were manufactured in
the USA by Firestone and come from a batch date stamped November 1941. The
plugs have never been used and come with their original cardboard box, which
will be included.
The spark plugs are MH-40 and F-60 types and they have been carefully mounted inside a
beautifully made domed glass presentation case with turned and polished oak
hardwood base, capped with green felt, to protect your surfaces. The domes are between 75 and 88mm high and 47mm in diameter; the base is 75mm in diameter (all measurements approximate). In
addition to the original box and its packing you will also receive the printed
wax paper Firestone information leaflet/wrapper supplied with these spark
plugs. The actual spark plugs are in excellent as-new condition, they have
not been damaged in any way and can be removed from the mount and should you so desire, even used for
their intended purpose. Once our small stock has
been sold there will be no more so don't miss this incredibly rare opportunity
to own a piece of automotive history and WW II memorabilia, with macabre overtones...