Casting numbers on engine block?

5SP33DB0X19

Daily Driver
What do the casting numbers on the block mean? Mine reads 138.2 FIAT then below that it reads 17. Surely this doesn't entale that I have the 17th 1500 engine FIAT ever produced, does it?
 
Casting numbers.

138 means a 1500 block

128 means a 1300 block.

I worked for a year in a foundry Installing a 30 ton ( melt ) arc furnace. When a part is cast in sand it requires a pattern and cores to be made. Each pattern will have a number. The pattern is placed in a form and the sand is packed around it and the form is split ( Cope and Drag ) and the pattern removed and is reused. In large foundries making thousands of the same casting more than 1 pattern is required, each will be numbered incase after the heat ( molten metal ) is poured a problem is identified and can be traced back to what pattern was used for Quality control.

TonyK.

Grimsby Ontario Canada.
 
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