External ignition coil of Bosch type. See pictures for measurements.

Two flat connectors. One to ground and the other to the pulse generator. Unfortunately the connectors are not marked but on an original coil ground is connected to the left one it's so recommend that you connect ground there. If you hold the coil with the connectors towards yourself, the core downwards and the spark cable outlet upwards it is the left flat connector you should connect to ground. You may without risk of damage switch the signal cable from the contact points with the ground cable to see if your moped runs better in that configuration. (Just in case if the factory have switched the connectors on your coil..) Between flat connectors: ~ 1,2 Ohm Flat connectors -> ignition outlet: ~ 9,36 kOhm No connection between core and connectors.