Long range rocket fired in Sinai - Egyptians say it is from 1973?

Bizarre:

Jihadist groups operating in Egypt's Sinai peninsula on Sunday fired a long range missile during a military drill, Egyptian security sources said.

The missile, believed to have a range of 45 kilometers, was fired from Nekhel in central Sinai towards the direction of Suez, Egyptian military sources told Ma'an.

The missile landed in a desert area and left a crater three meters deep and two meters wide.

Egyptian military experts said it is likely that the missile was an unexploded Israeli ordnance left behind from wars in the Sinai peninsula.

A forty year old Israeli rocket that is finally being fired - during a military drill?

Given that hundreds of Grad and other rockets with that range have traversed the Sinai in recent years on their way to Gaza, this claim seems ludicrous.

(h/t Gidon Shaviv)