Matthew Poole and continuators on 1 Kings 9:28

28 And they came to Ophir , and fet from thence gold, four hundred and twenty talents , and brought it to king Solomon.

A place famous for the plenty and fineness of the Gold there; Of which see Gen. 2. 11, 12. Iob 22. 24. and 28. 16. Psal. 45. 9. Isa. 13. 12. It is manifest and agreed, that it was a part of the East-Indies, which though very remote from us, yet was far nearer to the Red-Sea, from whence they might easily Sail to it in these Ancient times, because they needed not to go far from the Coast to come to it, because they might (according to the manner of these first Ages) Sail all along near the Coast, though the Voyage was thereby more tedious, which was the reason why three Years were spent in it. And here, and here onely were to be had all the Commodities which Solomon fetched from Ophir, 1 King. 10. 22.

In all there came to the King 450 Talents, whereof it seems 30 Talents were allowed by Solomon to Hiram and his Men for the Voyage, and so there were onely 420 that came clearly into the King's Treasury.