Greetings all. I bought a partial restoration a few months back knowing the vin tag on the A pillar had been lost. Per a post I saw here before I bought the car I knew the vin as stamped in the frame in 2 locations. I finally pulled the body today using an engine hoist and found the 2 locations the vin had been stamped in. My issue is both the vins start with 57B#######, there is no A,B,C,D preceding the build year, "V" marking is much less of a concern. I have had the 2 locations soaking in muriatic acid for over an hour and no extra character has appeared. Does anyone have an suggestion on what to do? Should I allow the locations to soak over night? What if the first/second characters were never stamped due to a factory error?