U552 was commissioned with the early war Switchboard (Round Type) as shown in the photos. Around mid-war a lot (but not all) of surviving early war Uboats were upgraded as able to the Late war Switchboards (Rectangular Type) as seen on U995.
The Late War Switchboards (rectangular types) as in Don Prince researched, used a lot less Copper but was expensive to upgrade.
Trumpeter 1/48th Uboat has made the mistake of modelling only the the Late war (rectangular) board
QUESTION. Does anyone know if U552 was upgraded to a Late War Switchboard at some stage??
thanks