The blank number of a yellow Lami from the 70s would be something like 1163 to 1166, depending on the power.
Currently those blanks are the SB 136 series. The old/new conversion is something like this:
1163 = SB 136 2M
1164 = SB 136 2F
1165 = SB 136 3M
1166 = SB 136 4M.
I'm pretty sure that Lami still makes the M blanks---they discontinued the 2F about 6 years ago. But I'm sure some shops still have some laying around, since graphite took over.
The most versatile of those blanks was always the 1165/136 3M. I've thrown everything from a Rebel to 5 oz and a chunk on it.
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