I had an 81 175, and it did not have a bash plate. I think in 81 the type of Vin changed; if it has a "PE" prefix on the frame, it should be pre-81. If it does not has a "PE" prefix on the frame, then 81.
"The bold adventurer succeeds the best.” - Ovid
WTB: Plated KTM EXC450/525 RFS, Honda CRF450X, Suzuki RMZ450