Hi Garth Fleet in the UK followed the same order and with their own connectors. I still have the Fleet rx.s and servos and apart from one model with all Fleet connectors I have cut the Fleet connectors off and soldered on the standard ones in the correct order.
Now I think about it Sanwa were much the same wiring order.

Fleet was agressively British and the founder uncompromising, I met him several times. I complained about his special short aerials with all of 6 yards range and the early sail winch he sold which twitched the whole time. He would accept no criticism of performance and no possible responsibility.

The tx.s were very good and much like the Futaba M3 in polished aluminium and lovely to hold. I had a very early non proportional set which was excellent, so not all bad. I still use the sets on 40Mhtz never having ventured to 2.4Ghtz.

His 40 Mhtz sets all had labels underneath proclaiming them as 35 Mhtz and this works for all the ones I tried just insert a 40Mhtz crystal into a 35 Mhtz set and they work fine.

Now of course it is almost fit and forget for nearly all manufacturers.
Regards
Roy

Just a little bit of trivia, I want to explain why speed controllers had plug wiring different in 1990. Here is an AI explanation( 🔌 Why the Traxxas XL‑1 Had “Odd” Wiring
The XL‑1 came out before the industry settled on the modern black–red–white order.
Traxxas used:

Red = +5V

Black = Ground

White = Signal

…but the pin order in the plug didn’t always match Futaba/JR receivers of the time.
So even though the colours were correct, the positions weren’t.

That’s exactly how people fried receivers or ESC BEC circuits — the polarity was reversed when plugged into a different brand’s RX.The photo shows red - black plug has been changed to the universal plug wiring.The one in the photo is my backup for the Sequin.