This pair of Jensen Q4 speakers probably came from a 1938 Seeburg Gem jukebox, but the 5 inch Q4 was also found in high end radios of that time period such as the Scott Allwave.

Both field coils check OK at 600 ohms and both voice coils at 8 ohms, but the cones were missing when I found these speakers.
The field coils do move freely, there isn't any dirt down inside them.