I'm sorry Chris. This figure was completely wrong.
I did a fair bit of googling, but couldn't find an answer as the search terms returned broad range of responses, not many of them to do with what I was looking for. So I tried chatgpt, and it gave me the answer I gave. I tried the same question today, and it told me the exchange rate wS 4.7.
So your uncle's remittance was a more accurate indicator of the exchange rate than anything I can find. I apologise. Or, if I was in the US, I would apologize.