Can`t make up my mind about this; looks in part like a `40s fighter/trainer,factory built,but the main panel looks like a `homebuilt` affair,probably American...also there is a significant mark on the ASI at 140 kts,but no other for Vmax,,and if it is single pointer,still seems limiting.There is a mark at 36" on the boost,which suggests it is powered in 450-600 hp range (+3lbs in old money)... So ,tandem/single,biplane or mono.....?