Franks said, with use of
... which is why annealling cracks do not show up in Vasart. ... So a crack could be a useful dating tool.
I have conisidered that point, too - as a serious piece in the "as-yet-unfinishable-jigsaw" of weights possibly made by Salvador. I have an example of an Ysart weight that seems to be early Vasart, with a crack right through the centre, top to bottom and with no blemishes on the surface, so unlikely to have been caused solely by knocks and bumps.
Maybe pre-war annealing problems could be a factor in showing my weight to be earlier than I currently think. And if so, other clues, such as the canes and finishing, might help to push other weights back into the 30s rather than "early Vasart".
On the other hand, perhaps it is only in the last decade that any general Vasart weights (as opposed to really unusual ones) have been seen as something that can generate some reasle profit? Maybe before that, many cracked Vasart weights were known but just binned because they had absolutely no resale value and very little academic interest to save them as discussion and reasearch items?
I'm still thinking about this sort of thing on occasion!