Hi Jeff,

I have seen then before on some Ebay listings for 1A2. My guess could be something on the card opened up and started to leak the goo out.

But check this out on classicrotaryphones.com

http://www.classicrotaryphones.com/forum/index.php?topic=20852.msg213382#msg213382


But the experts would know for sure as I am not in anyway a electronics expert.

Brian