Modern Vespa

Can anyone tell me what this stamp represents on the engine? Zoom in on the picture, it's at the very bottom.
Thanks for any help or comments!

These are the mating numbers during machining and both should be the same. Yours are two different halves…

that stamp indicates the case number (not the engine number or ID) and is used in production to make sure that the two halves are machined together and stay together for proper assembly.

it's not great to have mis-matched case halves, it's not the end of the world either, but there can be problems with mis-matches.

I'm guessing this will be the least of your problems.

let's see the rest of the bike.

That means your cases are NOT a matched pair, & the rest of the scoot shows signs of Bodginess.

When cases were made they would put the 2 sides together then finish off the round parts for where the crank fits & add the 3digit number... that way the 2 sides were perfectly matched/aligned & therefore crank would sit nicely in place... otherwise there is a chance 1 side is a bees-dick out of alignment and there would always be side load on bearings or worst case, the crank would bind up etc.

BTW; you may want to look at lower rear shock, as that bolt appears to be on a different angle to the mount (ie. bushes knackered & motor is sitting on a lean).

Oh, those wacky Vietnamese.....