Built in 1977, delivered in 1984. It had some unique capabilities, beyond just being a replenishment ship, as designed by the UK. It was modified to carry more ammunition, (missile resupply), intelligence gathering, even mine counter measures and ASW. More of a command ship than resupply. It had two large hangars and could carry 3 helicopters. I don't know if any birds went down with it.
This is a huge loss to the Iranian Navy.