I don't think they're as tough as Hindu, it's not really hard to find an example.
But oddly, when I joined and got interested in the factory as well as the brand I needed one "easy" back. Yep, the 649 OP. A gap that only took a few minutes to fill.
So maybe tougher than other 150's, but not all that hard.
For what it's worth, my collection is a bit odd because SC 350/460 f25 is supposed to be tougher than the others, but I had more of them than any other 350/460.
Steve B
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