So where and for what species did they use these lures, please? Mahseer .. barra?
For Ravas/Threadfin and Barramundi, but I remember some of the guys who fished fresh water did so for Mahseer too, but mostly for the former salt water species given the distances they needed to cast, we needed heavy spoons.
Most of us used to make our own spoons, I had a homemade spoon that was given to me by a friend of mine that was well over 50 grams perhaps more like 70, Mild Steel; chrome plated, flat, tapered 2 cm at one end about and 1.5 - 1.7 cm at the other, about 4mm thick. It was the most effective spoon I have ever used. The bend was towards the front about a third of its length from the top. It had a more angular edges that were slightly rounded with a grinder/File. The reason I believe this spoon was so effective was the positioning of the bend. It caused the spoon to "flutter" in the water as opposed to "wag". I made several copies of brass and have a few even today. You could cast it a devil of a distance and boy did it work. Treble hooks were at both ends of the lure.
We even had guys who made heavy spoons, old timers will remember a guy in Mumbai called Ivan Wallace who made his famous Dexter and Heavy Dexter which were very popular. I still have these spoons. Some of the guys named these spoons "Dodger" because they complained they wagged too mush and the fish missed the lure, so the straightened them a bit or glued a lump of lead if the depression at the back.
Ha Ha...miss those days, when I had more fish than equipment to my name :)