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Got it. Unfortunately even Jim could not get information on the meaning of the numbers.

Could be, but does it really matter? A typical SR is in the 59-61 HRC range. If the razor was at that hardness, and we do not know that, it will shave just fine. If you want a really hard tempered ...

just a model number, like many Solingen and other Japanese razors. I doubt anyone but the maker knows exactly what it means

Do you have pictures?

I have had several Swedish steel Western Iwasaki and several Tamahagane ones, and they have been great. Now the reason for the chippiness of yours may be the steel but also could be stones. In any...

The front side always is stamped with the Iwasaki stamp, the back states that it is made from tamahagane, and the batch number and which razor in the batch. They were made in batches of 10, so this...

All stamps are authentic, but tI think that is a 5/8 blade, or at least the pics make it looks smaller.
Any way someone got a great shaver, and a true masterpiece of steelworking

I do not see how that post is related to the topic?
But if you care to know, Iwasaki is nationally recognized in Japan for his metal-smith knowledge and abilities.
Their so called Swedish Steel...

on eBay the prices of the Tamahagane western Iwasaki are x2 or more what they go for in Japan.
Those guys know what there are buyers here and mark up accordingly.