The layout of the “english” could be either British (maybe Birmingham Proof House details of imported Russian made ammo); OR Russian done in preparation for exporting to some English Speaking country, again probably Britain.
The use of the crossed Seven is typically European (and Russian), but NOT British, unless the writer is of European Origin…say a refugee Pole or Hungarian etc from WW II and later (a Lot of Poles remained in Britain after WWII rather than go back to their country under communism.)
The cursive script has an indication that it was written by someone whose writing was developed in Europe, in any case, probably as a child.
I remember my “copperplate” writing classes in classic “English” cursive script back in the 1950s ( using steel pen and ink)…I can still write that way if I concentrate…European cursive ( even with individual country differences) of the period, is different in style from English 1950s and 60s cursive.
Also the use of Independant ( semi Block) capitals with normal cursive is a sign of someone not used to the “colourful” and almost Gothic English Cursive capitals.
The actual layout of the details ( 'drawn by, checked by" etc, is typically British Engineering Practice, or used by someone familiar with British Engineering Drawing Practice.
Anyway, an interesting item.
PS, find a Forensic Handwriting expert and see what they make of it…