340 CRANK?

I purchased a 340 dated December 1968. It appears to be completely stock and doesn't appear to have ever been apart. The pistons and rods have original casting numbers. But I can't find any casting number on the crank. The crank is a steel one and the first and last rod journals were drilled for balancing, I believe. I am attaching pictures of the crank. If you zoom in on them you can see thin metal left over from being drilled.

Has anybody ever heard of a 340 crank that had no casting number? And would you agree that this appears to be a stock 340 crank?

Thanks for you help.

View attachment 1715068799

View attachment 1715068800

View attachment 1715068801

View attachment 1715068802
I purchased a 340 dated December 1968. It appears to be completely stock and doesn't appear to have ever been apart. The pistons and rods have original casting numbers. But I can't find any casting number on the crank. The crank is a steel one and the first and last rod journals were drilled for balancing, I believe. I am attaching pictures of the crank. If you zoom in on them you can see thin metal left over from being drilled.

Has anybody ever heard of a 340 crank that had no casting number? And would you agree that this appears to be a stock 340 crank?

Thanks for you help.

View attachment 1715068799

View attachment 1715068800

View attachment 1715068801

View attachment 1715068802