WHAT TYPE OF COIN PRESS was used in the Bombay Mint in the late 19th Century?
When we look at many of our AU/MS coins, especially the large ones, we can see radial flow lines. They are best seen near the coin's rims. The flow lines become longer, deeper, and more noticeable on coins as the die is used.
I have imaged a "dollar sized" silver British trade dollar struck at the Bombay Mint. The lines on this coin are not in the usual radial direction! They are curved away from the center. I'm trying to understand why.
Knowledgeable numismatists have said that steam-operated screw presses were sent to the Bombay Mint.
I think this discussion should be moved to the World Coin Forum.