Simms Vernier AMILCAR coupling. Please see both photos. Diameter at the tooth side 14,7 mm. (length 8mm). Diameter at the other side:15,7 mm. Asking price/your offer.
AMILCAR MODEL M ENGINE DISMANTLED LONG AGO, SEEMS COMPLETE TO ME OTHER THAN MISSING CYLINDER HEAD, REPLICA ALUMINIUM HEADS ARE AVAILABLE HERE IN FRANCE. GOOD BLOCK, NO CRACKS. CAN BE DELIVERED TO UK END OF JULY.