Yes, and there he is...thank you.

I knew somebody must know, and somebody did!

Inevitable follow-up is...Pro seal "sportsman" vs. pro seal "race"?...
....but I won't go there. It's safe enough to assume the cheaper ones aren't going to have the Napier second. The JE rings look to be a good value.

I've got plenty of time to decide which way to go...

Thanks for all the replies.