That was the size of our 5-sen coin ! Ha ha !
In the days past, when I was not so old yet, this was a favorite metaphorical hyperbole to describe situations, where someone had a grossly sheepish under-appreciation of the prevailing market prices.
Do we still use this kind of expression ?
Well, for those who do not know, back in 1967 the 5-sen coin was much the same size as it is today, but it packed a much more powerful purchasing punch. With it, we could buy 2 Hacks cough drops, or a glass of sweetened ice-water, or perhaps even a piece of ketupat.
Now ? Five sen can buy almost next to nothing. Even the use of a public toilet costs 30-50 sen per wee wee. Haiz. In fact, some vendors would not even accept more than 3 pieces of 5-sen coins per transaction!