T.R. McElroy – “Amateur” Model 100 Stream Key (with Plastic Base)
The plastic-based Streamkey was offered between 1940 and 1942. Early on, there were three models offered (from the July 1940 Distributor's Price List):
100, Amateur model, black plastic, cadmium plated parts, no switch (Mac's term for the circuit closer).
B200, black plastic "Professional" model, chromed parts, with switch.
G200, same "Professional" in grey plastic.
In 1941 it was offered in grey or black plastic (from an ad) as:
A-100, no switch or speed key lip
S-100, with switch and speed key lip. (This seems to have taken the place of the "model 200.")
In 1941, the plastic key was offered as the S-100 "amateur model" (from the spring-summer 1941 catalog, and in comparison to the metal models): black plastic with switch.
A 1942 photo of the key as part of a practice set (ad, on cast iron base with the Oscillatone) shows the S-100 as a black plastic key with circuit closer and wedge lip on the connector strap.
It is not clear what the "speed key lip" means, since there is a wedge lip on the anvil contact connector strap of every one I have seen. However, since this is a plastic key, it requires another contact underneath that strap for a bug wedge. There is a cast hole in the base of every plastic key for such a contact. But I have seen only one plastic key with that lower contact installed (it is a bolt, with a strap under the base connecting to the opposite wire terminal), and that key was a cad plated Amateur model !
That's Mac, being his usual unpredictable self.
The above information was supplied by Tom French W1 IMQ. From his website www.artifaxbooks.com