ID question for a super m block

I was thinking that everybody that is building a puller wants the C-281 engine. A SM block will have a C-264 cast into the block above the oil filter.
 
Original tractor blocks have this casting number.
SM, SMTA, super 6 series and the 400 blocks that didn't come with a dipstick ended in R1. C264 with dipsticks and C281 blocks ended with R2 like the picture.
Industrial and replacement blocks can have another casting number.
a133232.jpg
 

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