Vintage aluminum intakes. Q&A

Hey everyone. I have a few questions about vintage intakes.
Number one;
On a LD340 intake that I have, it has 2nd stamped into it. Any idea why? I wouldn't think that Edlebrock would sell a junk intake?
Number two;
Has anyone ever seen an Offenhouser Dual-Port 360 intake before? Are they any good?

Thanks,