Don't worry, these Firestone spark plugs may be over 70 years old but they are no longer radioactive and perfectly safe and legal 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.

We have only a very small number of these spark plugs, most of which came from bankrupt auto parts stores and have never been used. They were manufactured in the USA by Firestone from batches made in the early to mid 1940s. Each plug comes with an original cardboard boxes, and a scanned copy of the original wax paper  information leaflet/wrapper. Please note that most of the cardboard boxes are in very good condition but a few show some signs of damage, however, we'll always do our best to include the best avaiilable whilst stocks last.

We currently have three types available, the smaller one (1) is an F-100; the two larger ones (2 & 3)  are  S-140 CL and S-120-CF.  The latter, see left, is particularly rare with a highly unusual pink-coloured porcelain insulator. All three types have been carefully mounted inside borosilicate glass domes with turned and polished wooden bases, Type 1domes measure approximately 90mm tall by 47mm in diameter, and types 2 and 3 are  120mm by  70 mm The wooden bases are 76 and 90mm in diameter respectively.

These spark plugs have been in storage for several decades and most are in 'as-new' condition. A few had signs of surface corrosion; this has been cleaned but it has to be said that minor blemishes like this are to be expected on vintage items. All are been mounted on custom designed 3D printed stands and can be easily removed, should you so desire, and even used for their intended purpose. Our stocks are now depleted and the chances of getting any more are small so don't miss this rare opportunity to own a highly unusual piece of automotive history and WW II memorabilia, with macabre contemporary overtones...