The photo is a 44A block with the cover on. Underneath are 10 screws and channels to guide the I/W leads and cord conductors.
I converted lots of 1A system 464 and 564 sets using the original color code to the new sets with amphenols, using the even count code. The T, R, B & H leads were in order, but the lamps used the yellow group. The first line lamp used Bl/Y, the second used Or/Y, etc.
Arthur P. Bloom "30 years of faithful service...15 years on hold"