An uncommon bottle found at the beach by daughter M2

So M2 daughter found this bottle in SA on a beach.





On the bottom it has text molded out of the glass -

PROP OF H.J.HEINZ Co. PTY LTD , and a number 257



Searching the web, there is info on the model of the bottle 257, but the images do not match the bottle in hand.

M2's has 14 fine flutes and is about as tall and thin as a glass 300ml Coke bottle from the 70's.
The top is designed for a normal cap, but also has a course thread that I believe is for a pouring spout top.
I think is was sold with Tomato sauce for cafeterias, or sauce of some type.





The Heinz 257 on the net is a fatter bottle and has less flutes, 8 only I think, like the broken bottle found by Kato and
used in the first pics to compare, so is not M2's but the number matches - maybe.



As far as I can find the found bottle is dating back to the 1920's, considering it was found on a popular country beach
and it is in great condition, with no others to compare to, is it possibly rare now?

Can anyone help with this please?

Possibly as rare as a sauce bottle can be, but, you never know, could have been from a short lived promo, how many people would save the old common ones anyway, could be rare just because of the latter fact too.
Nice find at any rate ! 8)