303 Sinai 23 and
304 Nile 23 - according to Russian Tekhnika i Vooruzhenie 8/1999, they both were competing designs and Sinai was chosen for production (it could be verified - I haven't found any firm info on Nile 23 in the web). Production of Sinai started only in 1989, but there is no information in the article if any were made that year, only in 1990 there were made 4 (now it starts at 1/88).
http://articles.janes.com/articles/J...-23-Egypt.html says, that first units were delivered in 1989.
According to the article, it carries 3 missiles Ayn Sakr, while Nile carried 2 - it could be verified (now Sinai has 4, Nile - 6). But there's no info on possible reloads.
Michal