Off a NR SKS...
Located on right side, same ONT. CA. as C.S.I., it's electro-penciled, not stamped.
I have found 2 names, no idea which is correct for S.S.I.: Sino Sports Incorporated and Safari Sports Incorporated.
Did you find anything on those company names? Anything linked to China Sports?
For others reading this...as per my private convo with GM, this is what I found on the NRs from the commercial database...
ALL NRs with 93xxx serials, have C.S.I. ONT CA on the LEFT side of the receiver, stamped in the same section as the model and made in china stamping.
Starting with the 94xxx serial guns, the early ones are marked with S.S.I. ONT CA on the RIGHT side of the receiver. Later serial 94xxx NRs go back to the C.S.I. ONT CA stamp, but still it the same right side spot as the S.S.I. guns. The S.S.I. stamps are rough, like a dot matrix or machine EP. The C.S.I. stampings on 94s go back to the crisp stamping like on the 93s.
NO 94s are import stamped on the left side. And some 94s have NO import stamping that I can see in the available pics.
They still all came through China Sports, as far as I can tell. My best guess is that whoever was doing the import markings on the first batch of 94s over in china mistakenly put SSI in stead of CSI. Either that, or China Sports had another legal name they used.