1- yes, probably a Basic Bag, mid-70s
2- either the Salearea Creeds or Serial Numbers Guide mentions "i" and "n" sometimes slipping through on genuine bags. Everything else looks ok.
http://search.reviews.ebay.com/members/salearea_W0QQcpnameZmembersQQprZsaleareaQQuqtZg
Thank you Hyacinth! I remember reading about the N sometimes sneaking through and thought I had seen it on one of the guides for I as well, but wasn't sure if I remembered correctly. Anyway, good time to go through and re-read the Salearea guides. There's a ton of great information in them and always good to keep refreshing one's mind

Again, thank you!