What is Collins 35A? Very early.
 

I have a Collins Type 35A, has a pot and terminal strips marked "Key" and
"Trans". It has the winged earth logo of 1934 - 1937. Inside is the pot
body, two coils, and two caps. Maybe a filter for the keying line? Black
wrinkle and about 7 inches long by 4 inches wide. Thanks for any help.

Dave
KF6BOM