Approximate Melt Value:
Copper value (75% by weight): around $0.11
Nickel value (25% by weight): around $0.04
Total Estimated Melt Value: approximately $0.15
Please note that this melt value estimation does not consider numismatic value. However, since your 1943 quarter has circulated, most likely, it doesn't hold any significant numismatic premium above its melting value.
For more accurate and up-to-date melt values, it's best to refer to reputable precious metal or silver pricing websites to get estimates of the current price of copper and nickel, and use those figures to calculate the total melt value, which can change regularly.