Keyhole OLT D2 modification and what it is worth?

The Olt calls were never Bakelite, they were all hard rubber! Both the shell and the tonal plugs were hardrubber untill 1956. After that year the shells were an ABS plastic and the tonal plugs were always hardrubber as long as it had the Reg.Mark 348205. In 1956 the new style D-2 was born and both the shell and the tonal plug was injected ABS plastic.
David
DJ Calls

 

yes!!!

 

It looks like the insert on the call on the left is also hard rubber, just the plastic barrel as David explained.

 

Thanks for answering that previous question I had and the info, David.......

 

I concur.

 

I thought Bakelite was another name or form of hard rubber. I need to study up!

 

Bakelite if im not mistaken came about in 1912 and it had a fiber mixed into the compound. It was mostly used for electricty and electronics a good insulator.
Hardrubber has a lot of carbon in the mixture thats what makes it so hard, but also so brittle, as most of us know you drop it and it will break right under the cork!!

 

All the calls are Old-Style D-2's. The one on the left has a plastic shell and the other two has hardrubber shells. If the trade mark 348205 is on anypart of the call it is made out of hardrubber. The trade mark was put on the calls in 1940.

 

As you can see on the 3 calls pictured the one on the right is a brown color, The reason for that is sunlight will make it turn color along with dish soap will make it turn color also. Also leaving it in the sunlight it will form a salt substance on the hardrubber part.

 

Thanks Dave for the info.