What brand of non-Lego bricks are these with hollow studs and diagonal walls on their undersides?

Question

Believe they are from the 1960’s, available in Australia.

Answer 1

I find the article Bricks on Display: a collection of interlocking building bricks on brickset to be a good source of information for this kind of question.

These appear to be Montini bricks (made by Berco Lux in Tiel, Holland, in the 1960s, as a clone of the early Lego Mursten) :

(images are from that same article)

The name of the brand should be engraved on the surface somewhere (between the studs afaict) - can you find it ?

Answer 2

1st guess Montini, made in The Netherlands, but mine had name atop. Do 2×x have pegs to fit hollow studs? Made of softer plastic than Lego is.