I bought off e bay as an electronic flasher for LED lights, it is made in China!!!! so I guess its must be the old bi metal strip type all I know is loading up the circuit slowed the flash rate down so it worked out in the end.

1940 Chevrolet 3/4-Ton
"Project XJ-PU-V12"
In the Stovebolt Gallery
More pix on Flickr

In business, words are words, explanations are explanations, promises are promises, but only performance is the true reality.