Monument to artillery-munitions man

'To artillery-munitions men for selfless labor in honor of the 250th anniversary of the foundation of 1718-1968.'
Foundation of what is not written. Strange. Probably because it was a top secret. But in 1718, as follows from the statement, filed by commandant brigadier Poroshin, there were built in Kronstadt, among the other things, a powder garrison magazine and artillery laboratory for the needs of the garrison. In all probability the countdown is from this.